GB2171633A - Separation of a reinforcing member from a multi-conductor electric cable - Google Patents
Separation of a reinforcing member from a multi-conductor electric cable Download PDFInfo
- Publication number
- GB2171633A GB2171633A GB08601311A GB8601311A GB2171633A GB 2171633 A GB2171633 A GB 2171633A GB 08601311 A GB08601311 A GB 08601311A GB 8601311 A GB8601311 A GB 8601311A GB 2171633 A GB2171633 A GB 2171633A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arms
- cable
- free end
- arm
- teeth
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Removal Of Insulation Or Armoring From Wires Or Cables (AREA)
Abstract
In a method of separating the flexible reinforcing member from a multi-conductor cable of trefoil cross-section, two pivotally inter-connected arms 11 of a spring-loaded pincer-like piercing tool are applied around the hole of the trefoil in which the reinforcing member is encapsulated at a position intermediate of the ends of the cable. Each arm 11 has an inwardly facing surface 12 of a shape such that the two arms will encompass the lobe and each of the arms has at its free end a tooth or teeth 14 which will interengage with the tooth or teeth at the free end of the other arm. The free ends of the two arms are urged towards one another against the action of the spring to cause the teeth to bite through the web joining the lobe to the other lobes of the trefoil-shaped plastics body of the cable. The web is split lengthwise of the cable to a sufficient extent to separate from the cable a length of reinforcing member. <IMAGE>
Description
SPECIFICATION
Overhead multi-conductor electric cables
This invention relates to multi-conductor electric cables of a construction suitable for their suspension above the ground and is especially, but not exclusively, concerned with multi-conductor cables of this kind for use in a telecommunication installation, for example, multi-conductor telecommunication cables for interconnecting the telephone equipment in a house or other building to a telecommunication network.
The invention is particularly concerned with a multi -conductor cable of this kind comprising two elongate electric conductors and a flexible elongate reinforcing member arranged with their axes substantially parallel and lying at the apices of a triangle, the conductors and reinforcing member being wholly encapsulated in a body of electrically insulating plastics material having a transverse cross-section of approximately trefoil shape. A multi-conductor cable of this construction will, for convenience, hereinafter be referred to as "a multi-conductor cable of trefoil cross-section".
When suspending a multi-conductor cable of trefoil cross-section above the ground, it is common practice at an upstanding support structure intermediate of the ends of the cable, to separate the flexible reinforcing member from the conductors of the cable and to wind the reinforcing member around a device to impart tension in the cable. We have found that separation of the flexible reinforcing member from the conductors of the cable at a position intermediate the ends of the cable without damaging the conductors or the reinforcing member is both tedious and difficult, and is especially difficult in cold weather when the plastics insulating material in which the conductors and reinforcing member are encapsulated is unusually hard.
It is an object of the present invention to provide an improved method of the apparatus for separating the flexible reinforcing member from a multiconductor cable of trefoil cross-section at a position intermediate of the ends of the cable.
According to the invention, the method comprises applying around the lobe of the trefoil in which the flexible reinforcing member is encapsulated at a position intermediate of the ends of the cable, two pivotally interconnected arms of a spring loaded pincer-like piercing tool, each of which arms has an inwardly facing surface or surfaces of a shape such that the two arms will substantially encompass said lobe and each of which arms has at its free end at least one tooth which will interdigitate with the tooth or teeth at the free end of the other arm; urging the free ends of the two arms towards one another against the action of the spring to cause the teeth to bite through the web joining said lobe to the other lobes of the trefoil shaped plastics body of the cable; and slitting said web lengthwise of the cable to a sufficient extent to separate from the cable a length of insulated flexible reinforcing member.
Slitting of the web joining the lobe in which the flexible reinforcing member is encapsulated to the other lobes of the trefoil-shaped plastics body of the cable may be effected by removing the piercing tool from the lobe, introducing into a hole or holes in the web left by the teeth the end of a knife blade, and slitting the web lengthwise of the cable to separate from the cable the required length of insulated flexible reinforcing member. Alternatively, the tooth or one of the teeth of one or each of the arms of the piercing tool may itself have a laterally extending knife edge which, when the piercing tool is moved lengthwise with respect to the cable slits the web joining said lobe to the other lobes of the trefoilshaped cable.
The invention also includes a hand tool for separating the flexible reinforcing memberfrom a multi-conductor cable of trefoil cross-section at a position intermediate of the ends of the cable, which hand tool comprises a pair of elongate arms arranged side by side and pivotally connected together at or near one of their ends and associated spring means urging the free ends of the arms apart, each of the arms having an inwardly facing surface or surfaces of such a shape that the two arms will substantially encompass a lobe of a multi-conductor cable of trefoil cross-section and having at the free end of the arm, at least one tooth which will interdigitate with the tooth or teeth at the free end of the other arm when the free ends of the two arms are urged together against the action of said associated spring means; and, carried at or near the free end of one or each of the arms, a stop which will limit the extent to which the teeth of the arms will engage thereby to eliminate or substantially reduce the risk that the inwardly facing surfaces of the arms will deform the plastics insulation of the lobe in which the flexible reinforcing member is encapsulated.
The tooth or teeth at the free end of each arm may take any convenient form. In one preferred embodiment, the teeth on each arm are in the form of a pair of prongs spaced apart in a direction parallel to the pivotal axis of the tool, the pair of prongs at the free end of one arm engaging between the pair of prongs at the free end of the other arm when the free ends of the arms are urged towards one another. In another preferred embodiment, the free end of one arm has a pair of prongs as above described and the free end of the other arm has a single tooth with a rectilinear cutting edge substantially parallel to the pivotal axis of the tool which will engage between the prongs of the other arm when the free ends of the arms are urged towards one the other.
Preferably, each of the arms carries at or near its free end a handle or finger grip to facilitate urging the free end of one arm towards the free end of the other.
The invention is further illustrated by a description, by way of example, of the preferred hand tool for separating the flexible reinforcing member from a multi-conductor cable of trefoil cross-section with reference to the accompanying drawing, in which Figure 1 is a transverse cross-sectional view of a multi-conductor telecommunication cable oftrefoil cross-section;
Figures 2 and 3, respectively, are side and end views of the preferred hand tool; and
Figures 4 and 5, respectively, are side and end views of an alternative form of teeth for use in the hand tool shown in Figures 2 and 3.
Referring to the drawing, the multi-conductor telecommunication cable of trefoil cross-section shown in Figure 1 comprises two elongate electric conductors 1 and a flexible elongate reinforcing member 2 arranged with their axes parallel and lying at the apices of a triangle. The conductors 1 and reinforcing member 2 are wholly encapsulated in a body 3 of electrically insulating plastics material having a transverse cross-section of approximately trefoil shape. The lobe of the body 3 in which the reinforcing member 2 is encapsulated has a longitu dinallyextending rib 4 serving to identify that one of the three lobes of the body in which the reinforcing member is encapsulated.
The hand tool shown in Figures 2 and 3 comprises a pair of elongate arms 11 arranged side by side and pivotally connected together near one of their ends and, positioned between the two arms, a leaf spring (not shown) urging the free ends of the arms apart.
Each of the arms 11 has inwardly facing surfaces 12 of such a shape that the two arms will encompass a lobe of a multi-conductor cable of trefoil crosssection and has at the free end of the arm a pair of prongs 14 spaced apart in a direction parallel to the pivotal axis of the tool. The pair of prongs 14 at the free end of one arm 11 engage between the pair of prongs at the free end of the other arm when the free ends of the arms are urged towards one another against the action of the leaf spring.Near the free end of one of the arms 11 is a depending stud 15 which, when the free ends of the arms are urged towards one another, will engage the opposite inner surface of the other arm to limit the extent to which the pairs of prongs 14 will engage, thereby to eliminate the risk that the inwardly facing surfaces 12 of the arms will deform the plastics insulation of a lobe encompassed by the arms. The stud 15 is secured to the arm 11 by nuts 17 by means of which the extent to which the pairs of prongs 14will engage can be adjusted as required. Attheirfree ends, the arms carry transversly extending handles orfingergrips 18.
The hand tool shown in Figures 4 and 5 differs from the hand tool shown in Figures 2 and 3 only insofar as the form of the teeth on the arms 21 of the tool are concerned, the finger grips being omitted.
The free end of the arm 21 has a pair of prongs 24 spaced apart in a direction parallel to the pivotal axis of the tool and the free end of the other arm has a single tooth 23 with a rectilinear cutting edge 25 parallel to the pivotal axis of the tool, which tooth will engage between the pair of prongs 24 of the other arm when the free ends of the arms are urged towards one another.
Claims (9)
1. A method of separating the flexible reinforcing member from a multi-conductor cable of trefoil cross-section at a position intermediate of the ends of the cable, which method comprises applying around the lobe of the trefoil in which the flexible reinforcing member is encapsulated at a position intermediate of the ends of the cable, two pivotally interconnected arms of a spring loaded pincer-like piercing tool, each of which arms has an inwardly facing surface or surfaces of a shape such that the two arms will substantially encompass said lobe and each of which arms has at its free end at least one tooth which will interdigitate with the tooth or teeth at the free end of the other arm; urging the free ends of the two arms towards one another against the action of the spring to cause the teeth to bite through the web joining said lobe to the other lobes of the trefoil shaped plastics body of the cable; and slitting said web lengthwise of the cable to a sufficient extent to separate from the cable a length of insulated flexible reinforcing member.
2. A method as claimed in Claim 1, wherein the tooth or one of the teeth of one or each of the arms of the piercing tool has a laterally extending knife edge which, when the piercing tool is moved lengthwise with respect to the cable, slits the web joining said lobe to the other lobes of the trefoilshaped cable.
3. A hand tool for separating the flexible reinforcing member from a multi-conductor cable of trefoil cross-section at a position intermediate of the ends of the cable, which hand tool comprises a pair of elongate arms arranged side by side and pivotally connected together at or near one of their ends and associated spring means urging the free ends of the arms apart, each of the arms having an inwardly facing surface or surfaces of such a shape that the two arms will substantially encompass a lobe of a multi-conductor cable of trefoil cross-section and having at the free end of the arm, at least one tooth which will interdigitate with the tooth or teeth at the free end of the other arm when the free ends of the two arms are urged together against the action of said associated spring means; and, carried at or near the free end of one or each of the arms, a stop which will limit the extent to which the teeth of the arms will engage thereby to eliminate or substantially reduce the risk that the inwardly facing surfaces of the arms will deform the plastics insulation of the lobe in which the flexible reinforcing member is encapsulated.
4. A hand tool as claimed in Claim 3, wherein the tooth or one of the teeth of one or each of the arms of the piercing tool has a laterally extending knife edge.
5. A hand tool as claimed in Claim 3 or 4, wherein the teeth on each arm are in the form of a pair of prongs spaced apart in a direction parallel to the pivotal axis of the tool, the pair of prongs at the free end of one arm engaging between the pair of prongs at the free end of the other arm when the free ends of the arms are urged towards one another.
6. A hand tool as claimed in Claim 3 or4, wherein the free end of one arm has a pair of prongs spaced apart in a direction parallel to the pivotal axis of the tool and the free end of the other arm has a single tooth with a rectilinear cutting edge substantially parallel to the pivotal axis of the tool which will engage between the prongs of the other arm when the free ends of the arms are urged towards one another.
7. A hand tool as claimed in any one of Claims 3 to 6, wherein the stop which will limit the extent to which the teeth of the arms will engage is adjustable
8. A hand tool as claimed in any one of Claims 3 to 7, wherein each of the arms carries at or near its free end a handle or finger grip to facilitate urging the free end of one arm towards the free end of the other.
9. A hand tool for separating the flexible reinforcing memberfrom a multi-conductor cable of trefoil cross-section substantially as hereinbefore described with reference to and as shown in Figures 2 and 3 or 4 and 5 of the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB858501448A GB8501448D0 (en) | 1985-01-21 | 1985-01-21 | Overhead multiconductor electric cables |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8601311D0 GB8601311D0 (en) | 1986-02-26 |
| GB2171633A true GB2171633A (en) | 1986-09-03 |
Family
ID=10573151
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB858501448A Pending GB8501448D0 (en) | 1985-01-21 | 1985-01-21 | Overhead multiconductor electric cables |
| GB08601311A Withdrawn GB2171633A (en) | 1985-01-21 | 1986-01-20 | Separation of a reinforcing member from a multi-conductor electric cable |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB858501448A Pending GB8501448D0 (en) | 1985-01-21 | 1985-01-21 | Overhead multiconductor electric cables |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8501448D0 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB451544A (en) * | 1935-09-16 | 1936-08-07 | William George Pankonin | Tool for removing staples |
| GB891028A (en) * | 1958-03-13 | 1962-03-07 | Elliott Lucas Ltd | Improvements relating to pliers, pincers, nippers and like hand tools |
| GB1341003A (en) * | 1972-04-12 | 1973-12-19 | Swingline Inc | Staple-removing device |
-
1985
- 1985-01-21 GB GB858501448A patent/GB8501448D0/en active Pending
-
1986
- 1986-01-20 GB GB08601311A patent/GB2171633A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB451544A (en) * | 1935-09-16 | 1936-08-07 | William George Pankonin | Tool for removing staples |
| GB891028A (en) * | 1958-03-13 | 1962-03-07 | Elliott Lucas Ltd | Improvements relating to pliers, pincers, nippers and like hand tools |
| GB1341003A (en) * | 1972-04-12 | 1973-12-19 | Swingline Inc | Staple-removing device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8501448D0 (en) | 1985-02-20 |
| GB8601311D0 (en) | 1986-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |