WO2017075218A1 - Cable clamp with a break assist mechanism - Google Patents

Cable clamp with a break assist mechanism Download PDF

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Publication number
WO2017075218A1
WO2017075218A1 PCT/US2016/059122 US2016059122W WO2017075218A1 WO 2017075218 A1 WO2017075218 A1 WO 2017075218A1 US 2016059122 W US2016059122 W US 2016059122W WO 2017075218 A1 WO2017075218 A1 WO 2017075218A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
blades
clamp
cable clamp
axial load
Prior art date
Application number
PCT/US2016/059122
Other languages
French (fr)
Inventor
Aly Fahd
Eric Ryan Chappell
Original Assignee
Commscope Technologies Llc
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 Commscope Technologies Llc filed Critical Commscope Technologies Llc
Priority to GB1805982.4A priority Critical patent/GB2557543B/en
Publication of WO2017075218A1 publication Critical patent/WO2017075218A1/en

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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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4469—Security aspects
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4471—Terminating devices ; Cable clamps
    • G02B6/44785—Cable clamps
    • 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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/48—Overhead installation
    • G02B6/483—Installation of aerial type

Definitions

  • the present disclosure relates generally to clamps for fiber optic cables. More particularly, the present disclosure relates to a cable clamp having a break assist mechanism for breaking a fiber optic cable.
  • An aerial arrangement of such cables has the advantages of relatively simple and flexible installation having a limited ground footprint, and permits space substantially below the cables to be used for other purposes.
  • An aerial arrangement also separates the cables from contact with people or roaming ground animals. Separation of any cable helps protect the cable from damage caused either inadvertently or through malicious vandalism.
  • Cables are frequently suspended aerially from poles or other support structures. Sometimes the cables may fall or otherwise move in an area that is not desired, for example, across a road. For safety purposes, it is desired to have the cables break when a certain strength or predetermined axial load is applied to the cable.
  • the predetermined axial load might be less than the normal axial load or normal strength of the cable.
  • the present disclosure is directed to providing a special clamp that causes the cable to break when the predetermined axial load is applied to the cable.
  • the present disclosure relates to a cable clamp including first and second clamping members between which a cable can be clamped.
  • the first and second clamping members can define a clamping region between the first and second clamping members.
  • the first and second clamping members can be moveable between an open position and a closed position.
  • the first and second clamping members can be configured to receive the cable in the clamping region when in the open position, and the first and second clamping members can be configured to clamp the cable in the clamping region when in the closed position.
  • the cable clamp can also include a break assist mechanism incorporated with the first and second clamping members.
  • the break assist mechanism can be configured such that the cable breaks when a predetermined axial load is applied to the cable in a first direction along a longitudinal axis of the cable.
  • the predetermined axial load can be less than a normal axial load capacity of the cable.
  • a cable clamp can include a body with first and second plates spaced apart along a longitudinal axis of the cable clamp.
  • the body can have a cavity to accommodate a cable.
  • the first and second plates can be moveable between an open position and a closed position.
  • the first and second plates can be configured to receive the cable in the cavity when in the open position, and the first and second plates can be configured to clamp the cable in the cavity when in the closed position.
  • the cable clamp also includes a break assist mechanism positioned within the body of the cable clamp such that the cable breaks when a predetermined axial load is applied to the cable.
  • a further aspect of the present disclosure relates to a method for ensuring that a cable breaks at a predetermined load that is lower than a normal axial load of the cable.
  • the method includes the step of incorporating a breaking structure into a cable clamp that is used on the cable.
  • the breaking structure can be configured to damage strength members of the cable when the predetermined load is applied to the cable.
  • Figure 1 is a diagrammatic view of a cable clamp including a break assist mechanism in a resting position in accord with the principles of the present disclosure.
  • Figures 2A is a diagrammatic view of the cable clamp shown in Figure 1 with one set of blades of the break assist mechanism in a cutting position.
  • Figures 2B is a diagrammatic view of the cable clamp shown in Figure 1 with another set of blades of the break assist mechanism in a cutting position.
  • Figure 3 A is a diagrammatic view of the cable clamp shown in Figure 1 with the one set of blades shown in Figure 2 A in complete extension.
  • Figure 3B is a diagrammatic view of the cable clamp shown in Figure 1 with the other set of blades shown in Figure 2B in complete extension.
  • Figure 4 is a cross-sectional view of a cable that is clamped between the cable clamp of Figure 1 in accord with the principles of the present disclosure.
  • Figure 5 is a cross-sectional view of the cable shown in Figure 4 between the cable clamp of Figure 2 in accord with the principles of the present disclosure.
  • Figure 6 is an end view of the cable clamp shown in Figure 1.
  • the present disclosure relates generally to a type of cable clamp.
  • the clamp can include first and second clamping members between which a cable can be clamped.
  • the first and second clamping members can be moveable between an open position and a closed position using bolts, rods, or other fasteners.
  • the first and second clamping members may be two halves that are identically formed to receive and clamp the cable.
  • At least one of the first and second clamping members can include a mounting structure (e.g., flange, bracket, tab, fastener opening, etc.) for allowing the clamp to be attached to another structure (e.g., wall, pole, or hand hole).
  • a break assist mechanism can be incorporated with the first and second clamping members such that the cable breaks when a predetermined axial load is applied to the cable in a first direction along a longitudinal axis of the cable.
  • FIG 1 illustrates a diagrammatic view of an example cable clamp 10 in accord with principles of the present disclosure.
  • the example cable clamp 10 can include first and second clamping members 12, 14 (e.g., first and second plates) between which a fiber optic cable 16 can be clamped.
  • the first and second clamping members 12, 14 can define a clamping region 18 (e.g., cavity) between the first and second clamping members 12, 14.
  • the first and second clamping members 12, 14 can be moveable between an open position (see Figure 4) and a closed position (see Figure 5).
  • the first and second clamping members 12, 14 can be configured to receive the cable 16 in the clamping region 18 when in the open position.
  • the first and second clamping members 12, 14 can be configured to clamp the cable 16 in the clamping region 18 when in the closed position.
  • the first and second clamping members 12, 14 can be identically formed and interchangeable, thus simplifying manufacturing and assembly of the cable clamp 10. It will be appreciated that the first and second clamping members 12, 14 can be selectively formed to be non-interchangeable as desired. In one example, the first and second clamping members 12, 14 can be cast aluminum pieces, other metals, composites, plastics, or the like can also be used.
  • the example cable clamp 10 can further include a break assist mechanism 20 incorporated with the first and second clamping members 12, 14.
  • the break assist mechanism 20 can be configured such that the cable 16 breaks when a predetermined axial load is applied to the cable 16 in a first direction Di or a second direction D 2 along a longitudinal axis Li of the cable 16.
  • the predetermined axial load can be less than a normal axial load capacity of the cable 16.
  • the term "normal axial load capacity" generally means the axial load required to break the cable without a cable clamp on it. In other words, it is the normal breaking point of the cable. As such, the cable clamp lowers the breaking point of the cable such that the cable can break when a lesser load is applied.
  • the predetermined axial load applied to the cable 16 is at least about 1800 N or in the range of 1700-1900 N.
  • the cable clamp 10 can include a body 22 that defines the clamping region 18 for receiving or accommodating the cable 16.
  • the body 22 of the cable clamp 10 can include a front end 24 and an opposite rear end 26.
  • the first and second clamping members 12, 14 can be spaced apart along the longitudinal axis Li of the cable clamp 10.
  • the break assist mechanism 20 can be positioned within the body 22 of the cable clamp 10 at both the front and rear ends 24, 26.
  • the break assist mechanism 20 can include a first set of blades 28 positioned near the front end 24 of the body 22 of the cable clamp 10 and a second set of blades 30 positioned near the rear end 26 of the body 22 of the cable clamp 10.
  • the first and second set of blades 28, 30 may have the same features and advantages.
  • the first and second set of blades 28, 30 depicted are configured to form an acute angle of extension 32, in a rest shape (e.g., resting position), relative to the longitudinal axis Li of the cable 16, although alternatives are possible.
  • the term "rest shape” generally means that first and second set of blades 28, 30 have a non- deformed shape that projects outwardly at an angle 32 relative to the cable clamp 10, when there is little to no force being applied to the cable 16.
  • the rest shape of the first and second set of blades 28, 30 can extend at an acute angle 32 between an interior surface 34 of the cable clamp 10 and the cable 16.
  • the first set of blades 28 engage and compress the cable 16 causing breakage of the cable 16 as the cable 16 is pulled in the first direction Di along the longitudinal axis Li of the cable 16 and the axial load applied to the cable 16 reaches the predetermined axial load. While the first set of blades 28 engage and compress the cable 16, the second set of blades 30 do not engage or compress the cable 16 but remain in the resting position so that the cable 16 slides through between the second set of blades 30.
  • the second set of blades 30 engage and compress the cable 16 causing breakage of the cable 16 as the cable 16 is pulled in the second direction D 2 opposite the first direction Di along the longitudinal axis Li of the cable 16 and the axial load applied to the cable 16 reaches the predetermined axial load. While the second set of blades 30 engage and compress the cable 16, the first set of blades 28 remain in the resting position and do not engage or compress the cable 16 so that the cable 16 slides between the first set of blades 28.
  • the first and second set of blades 28, 30 can each continue to flex toward a shape of extension.
  • Figure 3A depicts the second set of blades 30 in extension as the cable is continuously pulled in the second direction D 2 along the longitudinal axis Li of the cable 16. As shown, the first set of blades 28 remain in the resting position as the second set of blades 30 continuously flex.
  • Figure 3B depicts the first set of blades 30 in extension as the cable is continuously pulled in the first direction Di along the longitudinal axis Li of the cable 16. As shown, the second set of blades 30 remain in the resting position as the first set of blades 28 continuously flex.
  • the term "shape of extension” generally means that the first and second set of blades 28, 30 are flexed such that their respective ends face each other and are at full extension (e.g., the first and second set of blades have a 90 degree angle relative to the longitudinal axis Li of the cable 16).
  • the cable 16 may weaken and break before the first and second set of blades 28, 30 reach their full extension or the shape of extension shown in Figures 3A and 3B. In other examples, the cable 16 may break upon the first and second set of blades 28, 30 reaching their full extension shown in Figures 3 A and 3B.
  • first and second set of blades 28, 30 each have proximal ends 36 and distal ends 38.
  • the proximal ends 36 of the first and second set of blades 28, 30 can be fixed to the interior surface 34 of the cable clamp 10 at respective flex or pivot points 40 on the body 22 to pivot or flex thereabout.
  • the distal ends 38 of the first and second set of blades 28, 30 can engage and cut into opposite sides of the cable 16 causing breakage of the cable 16 as the cable 16 is respectively pulled in the first or second directions Di, D 2 along the longitudinal axis Li of the cable 16 and the axial load applied to the cable 16 reaches the predetermined axial load and flexes between the rest shape and the shape of extension.
  • Figures 2A and 2B respectively illustrate the distal ends 38 of the first and second set of blades 28, 30 in a cutting position to pinch and cut into the cable 16.
  • the distal ends 38 of the first and second set of blades 28, 30 pivot about their respective pivot points 40 when the cable 16 is pulled in the first or second directions Di, D 2 .
  • the first set of blades 28 can be flexible such that they swing toward the first direction Di when the cable 16 is pulled with a force that meets the predetermined axial load.
  • the first set of blades 28 continue to cut into the cable 16 as the first set of blades 28 flex about the pivot point 40 between the rest shape (see Figure 1) and the cutting position (see Figure 2B) in order to break the cable 16.
  • the second set of blades 30 can be flexible such that they swing toward the second direction D 2 when the cable 16 is pulled with a force that meets the predetermined axial load.
  • the second set of blades 30 continue to cut into the cable 16 as the second set of blades 30 flex about the pivot point 40 between the rest shape (see Figure 1) and the cutting position (see Figure 2A) in order to break the cable 16.
  • FIG. 4-5 a cross-sectional view of the cable 16 is shown between the first set of blades 28.
  • the first set of blades 28 is shown in Figures 4-5, it will be appreciated that the same description can apply to the second set of blades 30 in the opposite second direction D 2 .
  • the first set of blades 28 can include a first front blade 42 and a second front blade 44 that are positioned on opposite sides of the cable 16.
  • the first front blade 42 is positioned on a top side 46 of the cable 16 and the second front blade 44 is positioned on an opposite bottom side 48 of the cable 16.
  • the first and second front blades 42, 44 pinch the cable 16 therebetween thereby cutting into strength members 50 such that the cable 16 breaks when the axial load applied to the cable 16 in the first direction Di along the longitudinal axis Li of the cable 16 meets the predetermined axial load.
  • the strength members 50 of the cable 16 can each have a cross-dimension CDi that is greater than a cross-dimension CD 2 of cable fibers 52 of the cable 16 such that the first set of blades 28 do not cut into the cable fibers 52.
  • the strength members 50 are or include a glass-reinforced plastic (GRP) rod having a longitudinal axis L 2 extending with the longitudinal axis Li of the cable 16.
  • GRP glass-reinforced plastic
  • the glass-reinforced plastic (GRP) rods can include a fiber reinforced polymer (e.g., plastic, epoxy, etc.).
  • the second set of blades 30 can include a first rear blade 54 and a second rear blade 56 that are positioned on opposite sides of the cable 16.
  • the first rear blade 54 is positioned on the top side 46 of the cable 16 and the second rear blade 56 is positioned on the opposite bottom side 48 of the cable 16.
  • the first and second rear blades 54, 56 pinch the cable 16 therebetween thereby cutting into the strength members 50 such that the cable 16 breaks when the axial load applied to the cable 16 in the second direction D 2 along the longitudinal axis Li of the cable 16 meets the predetermined axial load.
  • first front and rear blades 42, 54 of the first and second set of blades 28, 30 can be attached to an interior surface 34a of the second clamping member 14 and the second front and rear blades 44, 56 of the first and second set of blades 28, 30 can be attached to an interior surface 34b of the first clamping member 12.
  • first and second clamping members 12, 14 can each include a plurality of openings 60 for selectively adjusting the space between the first and second clamping members 12, 14.
  • fasteners 62 can be inserted through respective openings 60 in the first and second clamping members 12, 14 to adjust the space between the first and second clamping members 12, 14.
  • the fasteners 62 are depicted as bolt-and-nut type fasteners, although other types of fasteners may be used. Other arrangements can be used to construct the tightening/loosing of the first and second clamping members 12, 14.
  • the first and second clamping members 12, 14 can include a hinge region that cooperates with one another and with the fasteners to form a hinge.
  • Hinging action can be obtained with the fasteners that are inserted through holes in the first and second clamping members 12, 14.
  • the holes allow the fasteners to loosen and tighten and to pivot within limits essentially about a hinge axis.
  • the pivoting can open the clamping region 18 when the fasteners are loosened and close the clamping region 18 to compress the cable 16 when the fasteners are tightened.
  • the fastener can include a bolt-and-nut fastener which passes through the holes of the first and second clamping members 12, 14. It will be appreciated that other mechanical arrangements can be used to construct the hinge and/or the fastener.
  • At least one of the first and second clamping members 12, 14 can include a mounting structure 58 (e.g., flange, bracket, tab, fastener opening etc.) (see Figure 1) for allowing the cable clamp 10 to be attached or mounted directly to another structure, such as, a pole, wall, hand hole, or other support means (not shown).
  • a mounting structure 58 e.g., flange, bracket, tab, fastener opening etc.
  • Methods in accordance with the principles of the present disclosure can relate to ensuring that a cable breaks at a predetermined axial load that is lower than a normal axial load of the cable.
  • One example method can include the step of: (1) incorporating a breaking structure into a cable clamp that is used on the cable.
  • the breaking structure can be configured to damage strength members of the cable when the predetermined load is applied to the cable.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Clamps And Clips (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

The present disclosure relates to a cable clamp including first and second clamping members between which a cable is clamped. The first and second clamping members can define a clamping region. The first and second clamping members can be configured to receive the cable in the clamping region when in an open position, and can be configured to clamp the cable in the clamping region when in a closed position. The cable clamp can include a break assist mechanism incorporated with the first and second clamping members. The break assist mechanism can be configured such that the cable breaks when a predetermined axial load is applied to the cable in a first direction along a longitudinal axis of the cable.

Description

CABLE CLAMP WITH A BREAK ASSIST MECHANISM
CROSS-REFERENCE TO RELATED APPLICATION
This application is being filed on October 27, 2016 as a PCT International
Patent Application and claims the benefit of U.S. Patent Application Serial No.
62/248,545, filed on October 30, 2015, the disclosure of which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
The present disclosure relates generally to clamps for fiber optic cables. More particularly, the present disclosure relates to a cable clamp having a break assist mechanism for breaking a fiber optic cable.
BACKGROUND
Cables are frequently suspended aerially from poles or other support structures. An aerial arrangement of such cables has the advantages of relatively simple and flexible installation having a limited ground footprint, and permits space substantially below the cables to be used for other purposes. An aerial arrangement also separates the cables from contact with people or roaming ground animals. Separation of any cable helps protect the cable from damage caused either inadvertently or through malicious vandalism.
SUMMARY
Cables are frequently suspended aerially from poles or other support structures. Sometimes the cables may fall or otherwise move in an area that is not desired, for example, across a road. For safety purposes, it is desired to have the cables break when a certain strength or predetermined axial load is applied to the cable. The predetermined axial load might be less than the normal axial load or normal strength of the cable. The present disclosure is directed to providing a special clamp that causes the cable to break when the predetermined axial load is applied to the cable.
In one aspect, the present disclosure relates to a cable clamp including first and second clamping members between which a cable can be clamped. The first and second clamping members can define a clamping region between the first and second clamping members. The first and second clamping members can be moveable between an open position and a closed position. The first and second clamping members can be configured to receive the cable in the clamping region when in the open position, and the first and second clamping members can be configured to clamp the cable in the clamping region when in the closed position. The cable clamp can also include a break assist mechanism incorporated with the first and second clamping members. The break assist mechanism can be configured such that the cable breaks when a predetermined axial load is applied to the cable in a first direction along a longitudinal axis of the cable. The predetermined axial load can be less than a normal axial load capacity of the cable.
Another aspect of the present disclosure relates to a cable clamp that can include a body with first and second plates spaced apart along a longitudinal axis of the cable clamp. The body can have a cavity to accommodate a cable. The first and second plates can be moveable between an open position and a closed position. The first and second plates can be configured to receive the cable in the cavity when in the open position, and the first and second plates can be configured to clamp the cable in the cavity when in the closed position. The cable clamp also includes a break assist mechanism positioned within the body of the cable clamp such that the cable breaks when a predetermined axial load is applied to the cable.
A further aspect of the present disclosure relates to a method for ensuring that a cable breaks at a predetermined load that is lower than a normal axial load of the cable.
The method includes the step of incorporating a breaking structure into a cable clamp that is used on the cable. The breaking structure can be configured to damage strength members of the cable when the predetermined load is applied to the cable.
A variety of additional aspects will be set forth in the description that follows. The aspects relate to individual features and to combinations of features. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a diagrammatic view of a cable clamp including a break assist mechanism in a resting position in accord with the principles of the present disclosure.
Figures 2A is a diagrammatic view of the cable clamp shown in Figure 1 with one set of blades of the break assist mechanism in a cutting position. Figures 2B is a diagrammatic view of the cable clamp shown in Figure 1 with another set of blades of the break assist mechanism in a cutting position.
Figure 3 A is a diagrammatic view of the cable clamp shown in Figure 1 with the one set of blades shown in Figure 2 A in complete extension.
Figure 3B is a diagrammatic view of the cable clamp shown in Figure 1 with the other set of blades shown in Figure 2B in complete extension.
Figure 4 is a cross-sectional view of a cable that is clamped between the cable clamp of Figure 1 in accord with the principles of the present disclosure.
Figure 5 is a cross-sectional view of the cable shown in Figure 4 between the cable clamp of Figure 2 in accord with the principles of the present disclosure.
Figure 6 is an end view of the cable clamp shown in Figure 1.
DETAILED DESCRIPTION
The present disclosure relates generally to a type of cable clamp. The clamp can include first and second clamping members between which a cable can be clamped. The first and second clamping members can be moveable between an open position and a closed position using bolts, rods, or other fasteners. The first and second clamping members may be two halves that are identically formed to receive and clamp the cable. At least one of the first and second clamping members can include a mounting structure (e.g., flange, bracket, tab, fastener opening, etc.) for allowing the clamp to be attached to another structure (e.g., wall, pole, or hand hole). A break assist mechanism can be incorporated with the first and second clamping members such that the cable breaks when a predetermined axial load is applied to the cable in a first direction along a longitudinal axis of the cable.
Figure 1 illustrates a diagrammatic view of an example cable clamp 10 in accord with principles of the present disclosure. The example cable clamp 10 can include first and second clamping members 12, 14 (e.g., first and second plates) between which a fiber optic cable 16 can be clamped. The first and second clamping members 12, 14 can define a clamping region 18 (e.g., cavity) between the first and second clamping members 12, 14. The first and second clamping members 12, 14 can be moveable between an open position (see Figure 4) and a closed position (see Figure 5). The first and second clamping members 12, 14 can be configured to receive the cable 16 in the clamping region 18 when in the open position. The first and second clamping members 12, 14 can be configured to clamp the cable 16 in the clamping region 18 when in the closed position.
The first and second clamping members 12, 14 can be identically formed and interchangeable, thus simplifying manufacturing and assembly of the cable clamp 10. It will be appreciated that the first and second clamping members 12, 14 can be selectively formed to be non-interchangeable as desired. In one example, the first and second clamping members 12, 14 can be cast aluminum pieces, other metals, composites, plastics, or the like can also be used.
The example cable clamp 10 can further include a break assist mechanism 20 incorporated with the first and second clamping members 12, 14. The break assist mechanism 20 can be configured such that the cable 16 breaks when a predetermined axial load is applied to the cable 16 in a first direction Di or a second direction D2 along a longitudinal axis Li of the cable 16. The predetermined axial load can be less than a normal axial load capacity of the cable 16. Herein, the term "normal axial load capacity" generally means the axial load required to break the cable without a cable clamp on it. In other words, it is the normal breaking point of the cable. As such, the cable clamp lowers the breaking point of the cable such that the cable can break when a lesser load is applied. In one example, the predetermined axial load applied to the cable 16 is at least about 1800 N or in the range of 1700-1900 N.
In one aspect, the cable clamp 10 can include a body 22 that defines the clamping region 18 for receiving or accommodating the cable 16. The body 22 of the cable clamp 10 can include a front end 24 and an opposite rear end 26. The first and second clamping members 12, 14 can be spaced apart along the longitudinal axis Li of the cable clamp 10.
The break assist mechanism 20 can be positioned within the body 22 of the cable clamp 10 at both the front and rear ends 24, 26. For example, the break assist mechanism 20 can include a first set of blades 28 positioned near the front end 24 of the body 22 of the cable clamp 10 and a second set of blades 30 positioned near the rear end 26 of the body 22 of the cable clamp 10. The first and second set of blades 28, 30 may have the same features and advantages.
The first and second set of blades 28, 30 depicted are configured to form an acute angle of extension 32, in a rest shape (e.g., resting position), relative to the longitudinal axis Li of the cable 16, although alternatives are possible. Herein, the term "rest shape" generally means that first and second set of blades 28, 30 have a non- deformed shape that projects outwardly at an angle 32 relative to the cable clamp 10, when there is little to no force being applied to the cable 16. In certain examples, the rest shape of the first and second set of blades 28, 30 can extend at an acute angle 32 between an interior surface 34 of the cable clamp 10 and the cable 16.
Referring to Figures 2A, 2B, 3 A, and 3B, the first and second set of blades
28, 30 can each flex from the resting position to a cutting position (see Figure 2 A, 2B) where the first and second set of blades 28, 30 begin to pinch and cut into the cable 16 as the cable 16 is respectively pulled in first or second directions Di, D2 along the
longitudinal axis Li of the cable 16. For example, the first set of blades 28 engage and compress the cable 16 causing breakage of the cable 16 as the cable 16 is pulled in the first direction Di along the longitudinal axis Li of the cable 16 and the axial load applied to the cable 16 reaches the predetermined axial load. While the first set of blades 28 engage and compress the cable 16, the second set of blades 30 do not engage or compress the cable 16 but remain in the resting position so that the cable 16 slides through between the second set of blades 30.
The second set of blades 30 engage and compress the cable 16 causing breakage of the cable 16 as the cable 16 is pulled in the second direction D2 opposite the first direction Di along the longitudinal axis Li of the cable 16 and the axial load applied to the cable 16 reaches the predetermined axial load. While the second set of blades 30 engage and compress the cable 16, the first set of blades 28 remain in the resting position and do not engage or compress the cable 16 so that the cable 16 slides between the first set of blades 28.
The first and second set of blades 28, 30 can each continue to flex toward a shape of extension. Figure 3A depicts the second set of blades 30 in extension as the cable is continuously pulled in the second direction D2 along the longitudinal axis Li of the cable 16. As shown, the first set of blades 28 remain in the resting position as the second set of blades 30 continuously flex. Figure 3B depicts the first set of blades 30 in extension as the cable is continuously pulled in the first direction Di along the longitudinal axis Li of the cable 16. As shown, the second set of blades 30 remain in the resting position as the first set of blades 28 continuously flex.
Herein, the term "shape of extension" generally means that the first and second set of blades 28, 30 are flexed such that their respective ends face each other and are at full extension (e.g., the first and second set of blades have a 90 degree angle relative to the longitudinal axis Li of the cable 16). In some examples, the cable 16 may weaken and break before the first and second set of blades 28, 30 reach their full extension or the shape of extension shown in Figures 3A and 3B. In other examples, the cable 16 may break upon the first and second set of blades 28, 30 reaching their full extension shown in Figures 3 A and 3B.
In other examples, the first and second set of blades 28, 30 each have proximal ends 36 and distal ends 38. The proximal ends 36 of the first and second set of blades 28, 30 can be fixed to the interior surface 34 of the cable clamp 10 at respective flex or pivot points 40 on the body 22 to pivot or flex thereabout. The distal ends 38 of the first and second set of blades 28, 30 can engage and cut into opposite sides of the cable 16 causing breakage of the cable 16 as the cable 16 is respectively pulled in the first or second directions Di, D2 along the longitudinal axis Li of the cable 16 and the axial load applied to the cable 16 reaches the predetermined axial load and flexes between the rest shape and the shape of extension.
Figures 2A and 2B respectively illustrate the distal ends 38 of the first and second set of blades 28, 30 in a cutting position to pinch and cut into the cable 16. The distal ends 38 of the first and second set of blades 28, 30 pivot about their respective pivot points 40 when the cable 16 is pulled in the first or second directions Di, D2.
The first set of blades 28 can be flexible such that they swing toward the first direction Di when the cable 16 is pulled with a force that meets the predetermined axial load. The first set of blades 28 continue to cut into the cable 16 as the first set of blades 28 flex about the pivot point 40 between the rest shape (see Figure 1) and the cutting position (see Figure 2B) in order to break the cable 16.
Similarly, the second set of blades 30 can be flexible such that they swing toward the second direction D2 when the cable 16 is pulled with a force that meets the predetermined axial load. The second set of blades 30 continue to cut into the cable 16 as the second set of blades 30 flex about the pivot point 40 between the rest shape (see Figure 1) and the cutting position (see Figure 2A) in order to break the cable 16.
Referring to Figures 4-5, a cross-sectional view of the cable 16 is shown between the first set of blades 28. Although, the first set of blades 28 is shown in Figures 4-5, it will be appreciated that the same description can apply to the second set of blades 30 in the opposite second direction D2.
In one example, the first set of blades 28 can include a first front blade 42 and a second front blade 44 that are positioned on opposite sides of the cable 16. The first front blade 42 is positioned on a top side 46 of the cable 16 and the second front blade 44 is positioned on an opposite bottom side 48 of the cable 16. The first and second front blades 42, 44 pinch the cable 16 therebetween thereby cutting into strength members 50 such that the cable 16 breaks when the axial load applied to the cable 16 in the first direction Di along the longitudinal axis Li of the cable 16 meets the predetermined axial load.
In certain examples, the strength members 50 of the cable 16 can each have a cross-dimension CDi that is greater than a cross-dimension CD2 of cable fibers 52 of the cable 16 such that the first set of blades 28 do not cut into the cable fibers 52. In some examples, the strength members 50 are or include a glass-reinforced plastic (GRP) rod having a longitudinal axis L2 extending with the longitudinal axis Li of the cable 16. Thus, the first set of blades 28 bite into the glass-reinforced plastic. In one example, the glass-reinforced plastic (GRP) rods can include a fiber reinforced polymer (e.g., plastic, epoxy, etc.).
In certain examples, the second set of blades 30 can include a first rear blade 54 and a second rear blade 56 that are positioned on opposite sides of the cable 16. The first rear blade 54 is positioned on the top side 46 of the cable 16 and the second rear blade 56 is positioned on the opposite bottom side 48 of the cable 16. The first and second rear blades 54, 56 pinch the cable 16 therebetween thereby cutting into the strength members 50 such that the cable 16 breaks when the axial load applied to the cable 16 in the second direction D2 along the longitudinal axis Li of the cable 16 meets the predetermined axial load.
In one example, the first front and rear blades 42, 54 of the first and second set of blades 28, 30 can be attached to an interior surface 34a of the second clamping member 14 and the second front and rear blades 44, 56 of the first and second set of blades 28, 30 can be attached to an interior surface 34b of the first clamping member 12.
In other examples, the first and second clamping members 12, 14 can each include a plurality of openings 60 for selectively adjusting the space between the first and second clamping members 12, 14. In one aspect, fasteners 62 (see Figure 6) can be inserted through respective openings 60 in the first and second clamping members 12, 14 to adjust the space between the first and second clamping members 12, 14. The fasteners 62 are depicted as bolt-and-nut type fasteners, although other types of fasteners may be used. Other arrangements can be used to construct the tightening/loosing of the first and second clamping members 12, 14. In certain aspects, the first and second clamping members 12, 14 can include a hinge region that cooperates with one another and with the fasteners to form a hinge. Hinging action can be obtained with the fasteners that are inserted through holes in the first and second clamping members 12, 14. The holes allow the fasteners to loosen and tighten and to pivot within limits essentially about a hinge axis. The pivoting can open the clamping region 18 when the fasteners are loosened and close the clamping region 18 to compress the cable 16 when the fasteners are tightened. The fastener can include a bolt-and-nut fastener which passes through the holes of the first and second clamping members 12, 14. It will be appreciated that other mechanical arrangements can be used to construct the hinge and/or the fastener.
In certain examples, at least one of the first and second clamping members 12, 14 can include a mounting structure 58 (e.g., flange, bracket, tab, fastener opening etc.) (see Figure 1) for allowing the cable clamp 10 to be attached or mounted directly to another structure, such as, a pole, wall, hand hole, or other support means (not shown).
Methods in accordance with the principles of the present disclosure can relate to ensuring that a cable breaks at a predetermined axial load that is lower than a normal axial load of the cable. One example method can include the step of: (1) incorporating a breaking structure into a cable clamp that is used on the cable. The breaking structure can be configured to damage strength members of the cable when the predetermined load is applied to the cable.
From the forgoing detailed description, it will be evident that modifications and variations can be made without departing from the spirit and scope of the disclosure.

Claims

CLAIMS:
1. A cable clamp compri
(a) first and second clamping members between which a cable can be clamped, the first and second clamping members defining a clamping region between the first and second clamping members, the first and second clamping members being moveable between an open position and a closed position, the first and second clamping members being configured to receive the cable in the clamping region when in the open position, and the first and second clamping members being configured to clamp the cable in the clamping region when in the closed position; and
(b) a break assist mechanism incorporated with the first and second clamping members, the break assist mechanism being configured such that the cable breaks when a predetermined axial load is applied to the cable in a first direction along a longitudinal axis of the cable, the predetermined axial load being less than a normal axial load capacity of the cable.
2. The cable clamp of claim 1, wherein:
(a) the predetermined axial load being applied to the cable is greater than about
1800N.
3. The cable clamp of claim 1, wherein:
at least one of the first and second clamping members includes a mounting structure for allowing the cable clamp to be attached to a pole.
4. The cable clamp of claim 3, wherein:
(a) the mounting structure is a bracket.
5. The cable clamp of claim 3, wherein:
(a) the mounting structure is a flange.
6. The cable clamp of claim 3, wherein:
(a) the mounting structure is a fastener opening.
7. The cable clamp of claim 1, wherein:
(a) the break assist mechanism includes a first set of blades positioned at a front end of the cable clamp, the first set of blades having a rest shape extending at an acute angle between an interior surface of the cable clamp and the cable.
8. The cable clamp of claim 7, wherein:
(a) the first set of blades flex from the rest shape to a cutting position as the cable is pulled in the first direction along the longitudinal axis of the cable.
9. The cable clamp of claim 8, wherein:
(a) the shape of extension of the first set of blades flex toward a 90 degree angle relative to the longitudinal axis of the cable to bite into glass- reinforced plastic.
The cable clamp of claim 9, wherein:
(a) the first set of blades includes a first front blade and a second front blade that are positioned on opposite sides of the cable, the first and second front blades pinch the cable therebetween to cut into strength members such that the cable breaks when the predetermined axial load is applied to the cable in the first direction along the longitudinal axis of the cable.
11. A cable clamp comprising:
(a) a body including first and second plates spaced apart along a longitudinal axis of the cable clamp, the body having a cavity to accommodate a cable, the first and second plates being moveable between an open position and a closed position, the first and second plates being configured to receive the cable in the cavity when in the open position, and the first and second plates being configured to clamp the cable in the cavity when in the closed position; and
(b) a break assist mechanism positioned within the body of the cable clamp such that the cable breaks when a predetermined axial load is applied to the cable.
12. The cable clamp of claim 11, wherein:
(a) the predetermined axial load being applied to the cable is greater than about 1800N.
13. The cable clamp of claim 11, wherein:
(a) the break assist mechanism includes a first set of blades positioned at a front end of the cable clamp, the first set of blades being having a rest shape extending at an acute angle between an interior surface of the cable clamp and the cable.
14. The cable clamp of claim 13, wherein:
(a) the first set of blades flex from the rest shape to a cutting position as the cable is pulled in a first direction along the longitudinal axis of the cable and the axial load applied to the cable reaches the predetermined axial load.
15. The cable clamp of claim 14, wherein:
(a) the first set of blades flex toward a 90 degree angle relative to the
longitudinal axis of the cable to bite into glass-reinforced plastic.
16. The cable clamp of claim 15, wherein:
(a) the first set of blades includes a first front blade and a second front blade that are positioned on opposite sides of the cable, the first and second front blades pinch the cable therebetween to cut into strength members such that the cable breaks as the cable is pulled in the first direction along the longitudinal axis of the cable and the axial load applied to the cable reaches the predetermined axial load.
17. The cable clamp of claim 13, wherein:
(a) the break assist mechanism includes a second set of blades positioned at a rear end of the cable clamp, the second set of blades having a rest shape extending at an acute angle between an interior surface of the cable clamp and the cable. The cable clamp of claim 17, wherein:
(a) the second set of blades flex from the rest shape to a cutting position as the cable is pulled in a second direction opposite the first direction along the longitudinal axis of the cable.
The cable clamp of claim 18, wherein:
(a) the second set of blades flex toward a 90 degree angle relative to the
longitudinal axis of the cable to bite into glass-reinforced plastic.
The cable clamp of claim 19, wherein:
(a) the second set of blades includes a first rear blade and a second rear blade that are positioned on opposite sides of the cable, the first and second rear blades pinch the cable therebetween to cut into strength members such that the cable breaks as the cable is pulled in the second direction along the longitudinal axis of the cable and the axial load applied to the cable reaches the predetermined axial load.
The cable clamp of claim 1, wherein:
(a) at least one of the first and second plates includes a mounting structure for allowing the cable clamp to be attached to a pole.
The cable clamp of claim 21, wherein:
(a) the mounting structure is a bracket.
The cable clamp of claim 11, wherein:
(a) the body includes a base having a planar surface coupled to and spacing the first and second plates.
The cable clamp of claim 23, wherein:
(a) the first and second plates extend downwardly from opposite sides of the
25. The cable clamp of claim 17, wherein:
(a) the first set of blades are positioned within the cable clamp at a front end of the body and the second set of blades are positioned within the cable clamp at an opposite rear end of the body. cable clamp of claim 25, wherein:
(a) the first front and rear blades of the first and second set of blades are
attached to the first plate and the second front and rear blades of the first and second set of blades are attached to the second plate.
27. The cable clamp of claim 17, wherein:
(a) the first and second set of blades each have proximal ends and distal ends, the proximal ends of the first and second set of blades each being fixed to an interior surface of the cable clamp at respective pivot points on the body to pivot thereabout. cable clamp of claim 27, wherein:
(a) the first and second set of blades are each flexible such that when the
predetermined axial load is applied to the cable, the distal ends of each one of the first and second set of blades engage and cut into opposing sides of the cable. cable clamp of claim 16, wherein:
(a) the strength members of the cable each have a cross-dimension that is greater than a cross-dimension of cable fibers such that the first set of blades do not cut into the cable fibers.
30. A method for ensuring that a cable breaks at a predetermined axial load that is lower than a normal axial load of the cable, the method comprising:
(a) incorporating a breaking structure into a cable clamp configured to receive and clamp the cable, the breaking structure being configured to damage strength members of the cable when the predetermined axial load is applied to the cable.
PCT/US2016/059122 2015-10-30 2016-10-27 Cable clamp with a break assist mechanism WO2017075218A1 (en)

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Applications Claiming Priority (2)

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US201562248545P 2015-10-30 2015-10-30
US62/248,545 2015-10-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023012484A1 (en) * 2021-08-06 2023-02-09 Javelo Health Limited Conduit securement device

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4662710A (en) * 1982-12-03 1987-05-05 Amp Incorporated Method and apparatus for breaking an optical fiber
US20030188432A1 (en) * 2002-04-06 2003-10-09 Temple Larry Dan Cable and wire stripper
US20040161218A1 (en) * 2003-02-19 2004-08-19 Sloan Robert C. System and method for protecting a fiber optic cable connector tip
WO2006113088A2 (en) * 2005-04-14 2006-10-26 Tyco Electronics Corporation Optical fiber repair apparatus with adjustable guide member and methods for using the same
US20150183623A1 (en) * 2012-07-27 2015-07-02 Plumettaz Holding Sa Linear Driving Device With Load Dependent Clamping Capability

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662710A (en) * 1982-12-03 1987-05-05 Amp Incorporated Method and apparatus for breaking an optical fiber
US20030188432A1 (en) * 2002-04-06 2003-10-09 Temple Larry Dan Cable and wire stripper
US20040161218A1 (en) * 2003-02-19 2004-08-19 Sloan Robert C. System and method for protecting a fiber optic cable connector tip
WO2006113088A2 (en) * 2005-04-14 2006-10-26 Tyco Electronics Corporation Optical fiber repair apparatus with adjustable guide member and methods for using the same
US20150183623A1 (en) * 2012-07-27 2015-07-02 Plumettaz Holding Sa Linear Driving Device With Load Dependent Clamping Capability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023012484A1 (en) * 2021-08-06 2023-02-09 Javelo Health Limited Conduit securement device

Also Published As

Publication number Publication date
GB2557543A (en) 2018-06-20
GB2593113A (en) 2021-09-15
GB2593113B (en) 2022-02-09
GB202109641D0 (en) 2021-08-18
GB201805982D0 (en) 2018-05-23
GB2557543B (en) 2021-08-25

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