CA1221525A - Pulling eye assembly - Google Patents
Pulling eye assemblyInfo
- Publication number
- CA1221525A CA1221525A CA000442535A CA442535A CA1221525A CA 1221525 A CA1221525 A CA 1221525A CA 000442535 A CA000442535 A CA 000442535A CA 442535 A CA442535 A CA 442535A CA 1221525 A CA1221525 A CA 1221525A
- Authority
- CA
- Canada
- Prior art keywords
- cable
- pulling
- eye
- rupturable
- assembly
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
-
- 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
-
- 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
- G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
- G02B6/54—Underground or underwater installation; Installation through tubing, conduits or ducts using mechanical means, e.g. pulling or pushing devices
- G02B6/545—Pulling eyes
-
- 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
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
- H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
- H02G1/081—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling using pulling means at cable ends, e.g. pulling eyes or anchors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The disclosure herein describes a pulling eye assembly for attachment to the terminal end of a communication fiber optic carrying cable which comprises an elongated body having one end attached to the cable and the other end equipped with an eye member adapted to be connected to a pulling device. A
rupturable member is mounted within the body and will rupture to separate the eye member from the body when the tension exerted by the pulling device exceeds a predetermined value, this value being less than that required to damage the optical fibers in the cable.
The elongated body further includes a swivel arrangement to prevent torsion in the cable as a result of the pulling action.
The disclosure herein describes a pulling eye assembly for attachment to the terminal end of a communication fiber optic carrying cable which comprises an elongated body having one end attached to the cable and the other end equipped with an eye member adapted to be connected to a pulling device. A
rupturable member is mounted within the body and will rupture to separate the eye member from the body when the tension exerted by the pulling device exceeds a predetermined value, this value being less than that required to damage the optical fibers in the cable.
The elongated body further includes a swivel arrangement to prevent torsion in the cable as a result of the pulling action.
Description
21~ZS
FIELD OF THE INVENTION
The present invention relates to a pulling eye assembly for engaging the terminal end of a commu-nication fiber optic carrying cable and for pulling the cable through trunking systems or the like.
B CKGROUND OF THE INVENTION
When communication cables formed of fiber optics are pulled through trunking systems for install-ation, the pulling tension exerted on the cable by the pulling device varies in response to the resistance offered to the cable during the pulling procedure. It has been noted that an excess pulling force will cause elongation of the cable thus resulting in exceeding the admissible tension which can be taken by the fiber optics present in the cable. Another factor in causing possible damage to a cable ana/or to its components is a torsion effect exerted on the cable during pulling.
It is an object of the present invention to provide at the terminal end of a communication fiber optic carrying cable a pulling eye assembly that includes a rupturable element that allows disconnection of the cahle to the pulling device whenever the pulling tension exceeds that which is permitted for the fiber optics.
It is a further object of the present invention to provide in a pulling eye assembly a swivel arrangement ` ~hich eliminates torsion in the cable during the pulling ,,, ~
:~21525 operation.
The present invention therefore relates to a pulling eye assembly which comprises, in its broadest aspect, an elongated body which is opened at one end to fixedly accommodate the cable; rupturable tension re-sponsive means mounted at the opposite end of the body;
and attachment means connected to the rupturable ten-sion responsive means remote from the elongated body;
the tension responsive means are ruptured thus freeing the cable from the pulling device whenever the tension exerted by the pulling device exceeds a predetermined value, which values is less than that required to dam-age the optical fibers in the cable.
In one embodiment of the invention, the ten-sion responsive means consist of an elongated memberwhich has a rupturable portion of restricted cross-sec-tion, the latter being determined in relation to said predetermined tension value.
In another embodiment of the invention, the attachment means include therein swivel means which allow free rotation of movement between the attachment means and the elongated body.
Other objects and further scope of applica-bility of the present invention will become apparent from the detailed description given hereinafter. It should be understood however that this detailed de-scription, while indicating preferred embodiments of the invention, is given by way of illustration only since various changes and modi-~ 3 ~ 1221~25 fications within the spirit and scope of the inventionwill become apparent to those skilled in the art.
Figure 1 is an elevation, partly sectional, of a pulling eye assembly made in accordance with the present invention and shown being mounted to a terminal end of a cable;
Figure 2 is an elevation of another embodiment of a pulling eye assembly made in accordance with the present invention and shown being mounted to an existing pulling eye assembly;
Figure 3 is an elevation, partly cross-section-al, of the e~bodiment illustrated in figure 2, showing separation after rupture;
Figure 4 is a cross-section taken along line 4-4 of figure 3;
Figure 5 is an elevation, partly cross-section-al, of another embodiment of the present invention;
Figure 6 is a cross-section taken along line 6-6 of figure 5;
Figure 7 is a cross-section taken along line 7-7 of figure 5; and Figure 8 is a cross-section taken along line 8-8 of figure 5.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to figure 1, there is shown a first embodiment of a pulling eye assembly, generally denoted ~221~S
1~, attached -co che cerininal end of a communication fioer optic carrying cable 12. Such caDle comprises a centrally located wife 14 about which coaxially extends a plurality of optical fibers ~not shown). Tne assembly 10 comprises a connector lo consiscing of an elongaced body having one end 16a formed of a tubular po~tion inco which is tightly secured the cerminal end of the ca~le. The manner of a-ctaching the terminal end of the cable ~o the connec.or 16 does not form part of the present invention; however, one such method consists of having a sefies of screws 18 which are pressed hard against the steel member 14 and a lock nut 19. Another method consists in c{imping a fiber optic cable to a pulling eye such as described in Vnited Scates Patent No. 4 337 923 issued July 6, 1982 ~o Jackson A. Smith.
The opposite end 16b of the connector 1~ also includes a hollow portion into which is threadedly en-gaged an attachment member generally denoted 22. The latter comprises an eye elenent 24 adapted for connection to a pulling device such as a winch (not shown), a cy-lindrical spacer 26 which has a portion 28 threadedly engaged in the end cavi~y of portion 16b and a rupture member 30 which has one end 32 threadedly engaged in the body of ~he eye member 24. The opposite end of the ruptu-re member has a flanged portion 34. Tne rupture memberhas a section 36 of reduced cross-section, the fonction of which will be descrlbed hereinbeiow.
Between the flanged portion 34 and the inner-most wall of section 28 of the spacer 26 are provided a plurality of annular friction disks 4~ (see figure 4) allowing free rotational movement of flange 34 relative to the spacer 26. To reduce wear due to this free rota-tion of the rupture member relative to the spacer, a sleeve 42 of wear resistant material extends from the discs 40 to the inner wall of the eye element 24.
A washer 44 is provided between the said inner wall of the eye member 24 and top wall of the spacer 26.
The main feature of the present invention is whenever the tension exerted by the pulling device on the eye member 24 exceeds a predetermined value, member 30 will rupture (see figure 3) at the reduced cross-section area 36 thereby freeing the eye element 24 fromthe body 15 to which remains attached the spacer 26.
This predetermined value is calculated to be slightly less than that which is required to damage the optical fibers in the cable which would be otherwise ruptured should the cable resists being pulled during the pulling operation.
~ urthermore, as an additional feature of the present in~ention, the annular discs 40 enable a rotation of the eye member 24 with respect to the body 16 thus aYoiding torsion in the cable 12 which again would cause damage to the optical fibers should the cable be over-twisted.
In figures 2 and 3, there is shown another embodiment of the present invention wherein the cons-truction of the pulling eye assembly is identical to that shown in figure 1 with the e~ception that one end 16a of the connector 16 is modified to engage, instead of the cable 12 of figure 1, a pulling eye connector 17 such as is conventionnally used and is shown and describ-ed in the above-noted U.S. patent. Hence, end 16a is modified to be connected to the eye member 17a of the assembly 17.
~ eferring to figures 5-8, another embodiment of the present invention is shown. The assembly consists of a body 116 which is connected to a cable 112 in a similar fashion as that described above in connection with figure 1. Body 116, in comparison to body 16 of figure 1, is slightly modified at end 116b to receive the attachment member generally denoted 122. The end 116b of the ~ody has a hollow cavity in which is received the tubular section 124 of the eye member 126. This tubular section receives therein a rupture element 130 having a central reduced cross-section 136.
The manner of securing the rupture element 130 to the eye me~ber 126 and the body 116 will now be des-cribed in relation to figures 6-8. The innermost cylin-drical portion 132 of the tubular section 124 of the eye member has a slot 134 which opens to the rear wall 142.
The rupture member has a transverse threaded opening 12~525 which comes into registry with the slot 134. A pin 146 threadedly engages the threaded opening together with the adjacent wall of the tubular portion of the eye member, that portion of the wall being also threaded.
The rupture member 130 includes a second trans-verse threaded opening which, when set in registry with a pair of axially aligned openings in the extension 124 of the eye element 126,threadedly engages a pin 150 to secure the rupture element to the extension 124.
In this embodiment, an excessive tension exert-ed by a pulling device on tne eye member 126 will cause rupture of element 130 in the restricted area 136. Hence, body 116 will separate from the eye member 126, leaving pin 146 inside the cavity 116b while pin 150 remair,s with the separated eye element 126.
It can be seen that free rotational movement of the pulling eye assembly relative to cable 112 is not possible with the embodiment illustrated in figure 5.
However, it will be evident that the body 16 of figures
FIELD OF THE INVENTION
The present invention relates to a pulling eye assembly for engaging the terminal end of a commu-nication fiber optic carrying cable and for pulling the cable through trunking systems or the like.
B CKGROUND OF THE INVENTION
When communication cables formed of fiber optics are pulled through trunking systems for install-ation, the pulling tension exerted on the cable by the pulling device varies in response to the resistance offered to the cable during the pulling procedure. It has been noted that an excess pulling force will cause elongation of the cable thus resulting in exceeding the admissible tension which can be taken by the fiber optics present in the cable. Another factor in causing possible damage to a cable ana/or to its components is a torsion effect exerted on the cable during pulling.
It is an object of the present invention to provide at the terminal end of a communication fiber optic carrying cable a pulling eye assembly that includes a rupturable element that allows disconnection of the cahle to the pulling device whenever the pulling tension exceeds that which is permitted for the fiber optics.
It is a further object of the present invention to provide in a pulling eye assembly a swivel arrangement ` ~hich eliminates torsion in the cable during the pulling ,,, ~
:~21525 operation.
The present invention therefore relates to a pulling eye assembly which comprises, in its broadest aspect, an elongated body which is opened at one end to fixedly accommodate the cable; rupturable tension re-sponsive means mounted at the opposite end of the body;
and attachment means connected to the rupturable ten-sion responsive means remote from the elongated body;
the tension responsive means are ruptured thus freeing the cable from the pulling device whenever the tension exerted by the pulling device exceeds a predetermined value, which values is less than that required to dam-age the optical fibers in the cable.
In one embodiment of the invention, the ten-sion responsive means consist of an elongated memberwhich has a rupturable portion of restricted cross-sec-tion, the latter being determined in relation to said predetermined tension value.
In another embodiment of the invention, the attachment means include therein swivel means which allow free rotation of movement between the attachment means and the elongated body.
Other objects and further scope of applica-bility of the present invention will become apparent from the detailed description given hereinafter. It should be understood however that this detailed de-scription, while indicating preferred embodiments of the invention, is given by way of illustration only since various changes and modi-~ 3 ~ 1221~25 fications within the spirit and scope of the inventionwill become apparent to those skilled in the art.
Figure 1 is an elevation, partly sectional, of a pulling eye assembly made in accordance with the present invention and shown being mounted to a terminal end of a cable;
Figure 2 is an elevation of another embodiment of a pulling eye assembly made in accordance with the present invention and shown being mounted to an existing pulling eye assembly;
Figure 3 is an elevation, partly cross-section-al, of the e~bodiment illustrated in figure 2, showing separation after rupture;
Figure 4 is a cross-section taken along line 4-4 of figure 3;
Figure 5 is an elevation, partly cross-section-al, of another embodiment of the present invention;
Figure 6 is a cross-section taken along line 6-6 of figure 5;
Figure 7 is a cross-section taken along line 7-7 of figure 5; and Figure 8 is a cross-section taken along line 8-8 of figure 5.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring to figure 1, there is shown a first embodiment of a pulling eye assembly, generally denoted ~221~S
1~, attached -co che cerininal end of a communication fioer optic carrying cable 12. Such caDle comprises a centrally located wife 14 about which coaxially extends a plurality of optical fibers ~not shown). Tne assembly 10 comprises a connector lo consiscing of an elongaced body having one end 16a formed of a tubular po~tion inco which is tightly secured the cerminal end of the ca~le. The manner of a-ctaching the terminal end of the cable ~o the connec.or 16 does not form part of the present invention; however, one such method consists of having a sefies of screws 18 which are pressed hard against the steel member 14 and a lock nut 19. Another method consists in c{imping a fiber optic cable to a pulling eye such as described in Vnited Scates Patent No. 4 337 923 issued July 6, 1982 ~o Jackson A. Smith.
The opposite end 16b of the connector 1~ also includes a hollow portion into which is threadedly en-gaged an attachment member generally denoted 22. The latter comprises an eye elenent 24 adapted for connection to a pulling device such as a winch (not shown), a cy-lindrical spacer 26 which has a portion 28 threadedly engaged in the end cavi~y of portion 16b and a rupture member 30 which has one end 32 threadedly engaged in the body of ~he eye member 24. The opposite end of the ruptu-re member has a flanged portion 34. Tne rupture memberhas a section 36 of reduced cross-section, the fonction of which will be descrlbed hereinbeiow.
Between the flanged portion 34 and the inner-most wall of section 28 of the spacer 26 are provided a plurality of annular friction disks 4~ (see figure 4) allowing free rotational movement of flange 34 relative to the spacer 26. To reduce wear due to this free rota-tion of the rupture member relative to the spacer, a sleeve 42 of wear resistant material extends from the discs 40 to the inner wall of the eye element 24.
A washer 44 is provided between the said inner wall of the eye member 24 and top wall of the spacer 26.
The main feature of the present invention is whenever the tension exerted by the pulling device on the eye member 24 exceeds a predetermined value, member 30 will rupture (see figure 3) at the reduced cross-section area 36 thereby freeing the eye element 24 fromthe body 15 to which remains attached the spacer 26.
This predetermined value is calculated to be slightly less than that which is required to damage the optical fibers in the cable which would be otherwise ruptured should the cable resists being pulled during the pulling operation.
~ urthermore, as an additional feature of the present in~ention, the annular discs 40 enable a rotation of the eye member 24 with respect to the body 16 thus aYoiding torsion in the cable 12 which again would cause damage to the optical fibers should the cable be over-twisted.
In figures 2 and 3, there is shown another embodiment of the present invention wherein the cons-truction of the pulling eye assembly is identical to that shown in figure 1 with the e~ception that one end 16a of the connector 16 is modified to engage, instead of the cable 12 of figure 1, a pulling eye connector 17 such as is conventionnally used and is shown and describ-ed in the above-noted U.S. patent. Hence, end 16a is modified to be connected to the eye member 17a of the assembly 17.
~ eferring to figures 5-8, another embodiment of the present invention is shown. The assembly consists of a body 116 which is connected to a cable 112 in a similar fashion as that described above in connection with figure 1. Body 116, in comparison to body 16 of figure 1, is slightly modified at end 116b to receive the attachment member generally denoted 122. The end 116b of the ~ody has a hollow cavity in which is received the tubular section 124 of the eye member 126. This tubular section receives therein a rupture element 130 having a central reduced cross-section 136.
The manner of securing the rupture element 130 to the eye me~ber 126 and the body 116 will now be des-cribed in relation to figures 6-8. The innermost cylin-drical portion 132 of the tubular section 124 of the eye member has a slot 134 which opens to the rear wall 142.
The rupture member has a transverse threaded opening 12~525 which comes into registry with the slot 134. A pin 146 threadedly engages the threaded opening together with the adjacent wall of the tubular portion of the eye member, that portion of the wall being also threaded.
The rupture member 130 includes a second trans-verse threaded opening which, when set in registry with a pair of axially aligned openings in the extension 124 of the eye element 126,threadedly engages a pin 150 to secure the rupture element to the extension 124.
In this embodiment, an excessive tension exert-ed by a pulling device on tne eye member 126 will cause rupture of element 130 in the restricted area 136. Hence, body 116 will separate from the eye member 126, leaving pin 146 inside the cavity 116b while pin 150 remair,s with the separated eye element 126.
It can be seen that free rotational movement of the pulling eye assembly relative to cable 112 is not possible with the embodiment illustrated in figure 5.
However, it will be evident that the body 16 of figures
2 and 3 could also be used to be attached to the eye mem-ber 126 of figure 5. Hence, various modifications and refinements may be brought to the present invention. It is therefore wished to have it understood that the present invention should not be limited in interpretation except ~5 ~y the terms of the following claims.
,................................................................. ~
,................................................................. ~
Claims (4)
1. A pulling eye assembly for attachment to a terminal end of an optical fiber cable, said assembly comprising:
- an elongated body opened at one end to fixedly accommodate said cable;
- rupturable tension responsive means mounted at an opposite end of said body, and - attachment means connected to said rupturable tension responsive means remote from said elongated body;
said rupturable tension responsive means rupturing when the tension exerted on said cable resulting from a pulling action exceeds a predetermined value, and freeing said attachment means from said elongated body, said predetermined value being less than that required to damage optical fibers in said cable.
- an elongated body opened at one end to fixedly accommodate said cable;
- rupturable tension responsive means mounted at an opposite end of said body, and - attachment means connected to said rupturable tension responsive means remote from said elongated body;
said rupturable tension responsive means rupturing when the tension exerted on said cable resulting from a pulling action exceeds a predetermined value, and freeing said attachment means from said elongated body, said predetermined value being less than that required to damage optical fibers in said cable.
2. A pulling eye assembly as defined in claim 1, further comprising swivel means allowing free rotational movement between said attachment means and said body.
3. A pulling eye assembly as defined in claim 1, wherein said rupturable tension responsive means comprises an elongated rupture member having a rupturable portion of restricted cross-section, said cross-section being determined in relation to said predetermined value.
4. A pulling eye assembly as defined in claim 3, wherein said attachment means include:
- an eye member;
- a cylindrical tubular member extending from said eye member and receiving therein said rupture member;
- first means securing one end of said rupture member in said tubular member;
- second means securing an opposite end of said rupture member to the opposite end of said body.
- an eye member;
- a cylindrical tubular member extending from said eye member and receiving therein said rupture member;
- first means securing one end of said rupture member in said tubular member;
- second means securing an opposite end of said rupture member to the opposite end of said body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000442535A CA1221525A (en) | 1983-12-05 | 1983-12-05 | Pulling eye assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000442535A CA1221525A (en) | 1983-12-05 | 1983-12-05 | Pulling eye assembly |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000502137A Division CA1228469A (en) | 1986-02-18 | 1986-02-18 | Pulling eye assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1221525A true CA1221525A (en) | 1987-05-12 |
Family
ID=4126665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000442535A Expired CA1221525A (en) | 1983-12-05 | 1983-12-05 | Pulling eye assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1221525A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994005929A1 (en) * | 1992-09-04 | 1994-03-17 | Canada Coupling, Inc. | Improved swivel pulling eye with breakaway |
| WO2003012948A1 (en) * | 2001-08-02 | 2003-02-13 | International Business Machines Corporation | A device for preventing cable damage during installation |
| NL1034340C2 (en) * | 2007-09-05 | 2009-03-09 | Masters Of Water B V | Tube pulling device for pulling tube through ground for e.g. irrigation, has connector connected with displacement housing, where tensile strength of connection between connector and housing is greater than tensile strength of connector |
| CN109541772A (en) * | 2018-11-23 | 2019-03-29 | 陈丽珍 | A kind of optical cable installation convolution twisting resistance elimination protective device |
-
1983
- 1983-12-05 CA CA000442535A patent/CA1221525A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994005929A1 (en) * | 1992-09-04 | 1994-03-17 | Canada Coupling, Inc. | Improved swivel pulling eye with breakaway |
| WO2003012948A1 (en) * | 2001-08-02 | 2003-02-13 | International Business Machines Corporation | A device for preventing cable damage during installation |
| CN100345349C (en) * | 2001-08-02 | 2007-10-24 | 国际商业机器公司 | Device for preventing cable damage during installation |
| NL1034340C2 (en) * | 2007-09-05 | 2009-03-09 | Masters Of Water B V | Tube pulling device for pulling tube through ground for e.g. irrigation, has connector connected with displacement housing, where tensile strength of connection between connector and housing is greater than tensile strength of connector |
| CN109541772A (en) * | 2018-11-23 | 2019-03-29 | 陈丽珍 | A kind of optical cable installation convolution twisting resistance elimination protective device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |