CA1109534A - Supporting insert for sealing cables in cable fittings - Google Patents
Supporting insert for sealing cables in cable fittingsInfo
- Publication number
- CA1109534A CA1109534A CA315,784A CA315784A CA1109534A CA 1109534 A CA1109534 A CA 1109534A CA 315784 A CA315784 A CA 315784A CA 1109534 A CA1109534 A CA 1109534A
- Authority
- CA
- Canada
- Prior art keywords
- supporting insert
- sealing
- supporting
- cables
- insert
- 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
-
- 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
- H02G15/00—Cable fittings
- H02G15/013—Sealing means for cable inlets
Landscapes
- Cable Accessories (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
ABSTRACT
A supporting insert, for sealing cables in cable fitting has groove-like recesses for the accommodation of the cables. The lateral ends of the recesses are closed off with break-way inserts. Projections extending radially outwards at the two ends of the supporting insert prevent lateral movement thereof when installed.
A supporting insert, for sealing cables in cable fitting has groove-like recesses for the accommodation of the cables. The lateral ends of the recesses are closed off with break-way inserts. Projections extending radially outwards at the two ends of the supporting insert prevent lateral movement thereof when installed.
Description
53~
The invention relates to a supporting insert for sealing systems to facilitate the introduction of a plurality of cables into cable fittings, using a plastic sealing compound.
When cables are being installed in cable fittings, the seal be-tween the casing of the cable and the sleeve has an important f~Un~t~n~- Sub-stantial difficulties arise when several small-diameter cables are to be introduced side by side, or together, into a single aperture in the cable fitting. In such cases, sealing has hitherto been carried out with a fill-ing of sealing compound. As described in German OS 2 209 629, this may be facllitated to some extent by the insertion of preformed fillers. In the case of thermoplastic sleeves with la~inated seals, however~ ~here is a danger of the relatively flexible and soft casings of small-diameter cables being pinched between the laminations during the closing operation making it impossible to close the sleeve completely. Where cables having casings of this kind are introduced into large apertures, there is also a danger of improper sealing due to deformation of the cable casing~ especially in the case of mechanical stressing by tension, compression or bending.
Now the invention is concerned with the problem of introducing a plurality of small-diameter cables into a single aperture, and of ensuring that the cables, which have relatively flexible casings, are supported in the sealing area and are protected against tensile and compressive forces.
It is also the purpose of the invantion to ensure that the sealing system itself is protected against such stresses. ~cco~ding to the invention there is provided a supporting insert for sealing syskems to facilitate the in-sertion of a plurality of cables into a cable fitting~ said supporting in-' ;~
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sert being of basically cylindrical cross section corresponding to the diameter of the aperture in the sealing system in which it is to be placed, and having axial groove-like recesses extending inwardly from the periphery of the insert; thin-walled, break-away webs being arranged at each end of at least some of said recesses; radially outwardly directed projections being arranged at each end of the said supporting insert, the distance between the said projections corresponding to the axial length of the sealing system.
The main feature of the invention is that a plurality of cables of small diameter can now be introduced into a large-diameter aperture in a sealing systemO Because of the flexible and relati~ely soft casings, cables of this kind are at risk while being installed in laminated sealing systems, since the casings may be pinched in the parting plane of the sealing element. Furthermore~ the cable fitting cannot be completely closed and leaks therefore occur. This is prevented by the support mg insert according to the invention, since the cablesare laid in the reces-ses in the lnsert. These inserts also make it possible to introduce more -cables than with conventional assembly, since the insertion width is increased9 i.e. the number of insertions possible in the parting plane is increased. Since several cables can be intr-oduced, this means that, under certain circumstances, a smaller type of sleeve may be usedO Another advantage of the invention is that the sides of the recesses are initially closed off with thin-walled, break-away inserts or webs. It is thus un-necessary to fit cables in all of the apertures, since ~illers, made of circular materia~ for example, may be placed between these webs and with . .
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the sealing compound these provide a seal, as when a cable is introduced.
These webs also act as stops to prevent lateral movement of the fillers under the action of compressive forcesO The supporting inserts themselves may be prevented from moving axially by forces, such as arise jM pressur-ized cable fittings, by projections directed radially outwards~ These projections are attached to the ends of the inserts in such a manner that the sealing system, preferably in the form of the dividedrl sealing element of a thermoplastic sleeve, is locked to some extent therebetween the supporting insert being thus completely immobili~ed axially~
The invention will now be explained in greater detail, by way of example onLy, in conjunction with the six figures attached hereto~ wherein Figures 1 and 2 illustrate a supporting insert having four recesses for introducing cablesO Figures 3 and 4 illustrate a supporting insert having onLy one such re~e~sO Figure 5 shows the use of the support-ing insert in a longitudinally divided cable sleeve. ~igure 6, which is part section through Figure 5, shows the position of a supporting insert between the parts of the sealing element.
The cross-sectional view, in Figure 1, of a supporting insert 1 having four recesses 2 for the accommodation of small-diameter cables en-veloped in plastic sealing compound, shows the arrangement of grooye like recesses 2 extending inwardly from the periphery. In this example, two thin-walled~ break-away inserts or webs 3 are left in position at the ends of the supporting insert~ or in other words in this case the supporting insert is used to install only two cables~ the other two recesses being fitted with fillers (not shown). Inser~s or webs 3 prevent the fiL:Lers and , .. - . :
, ~
, ,'.,', , , the sealing compound ~rom moving. In the area of their fracture lines inserts or webs 3 have notches 5 defining a line of weakness to facilitate and locate the break. Outwardly-directed projections 4 extend radially from the supporting insert 1 and serve to position the insert within the sealing system, the lat~er being preferably in the form of a divided sealing element of a longitudinally-divided cable sleeve. It is thus impossible for axial forces to cause lateral movement of the insert.
Figure 2 shows the suppor~ing insert 1 having a visible recess 2 and having inserts or webs 3 at the ends and lateral projections ~0 The distance between projections 4~ and therefore the length of the sealing insert, is determined by the sealing system accommodating the insert. This also makes axial movemen~ of the entire sealing system impossible.
In ~igure 3~ supporting i~sert 12 has only one recess 13 and one out-wardly-directed projection 14. ~ side elevation of this embodiment is illustrated in Figure 4 which shows the location of the cross-section sho~m in Figure 30 This design is particularly sui~able for introducing a cable which is especially endangered, because of its flexibility, while being introduced into a cable apert~re between the parting planes of a sealing element. This supporting insert 12 is also very suitable for use as a ~0 closure element for a cut-out cable aperture~ in which case a filler~ made of circular material and enveloped in sealing compound, is inserted into the recess 130 In this case the lateral inser~s or webs 3 (not shown) in Figure 3 are not broken away.
Figure ~ shows the manner in which several small~dlameter cables 6 are inserted into the aper~lure in a sea]ing element by a means of a sup-':' -.
9S39~
porting insert 1 according to the invention. Longitudinally~divided cable sleeve 9~ which is closed by means of a clamping rail 10, has sealing ele-ments at each end in the form o~ semi-circular parts 8. Cable ~pertures are arranged in the parting plane between parts 8, one of these apertures containirlg a large-diameter cable 7 and the other containing a supporting insert 1 with four cables 6. Additional sealing is provided by sealing compound 11. The figure also shows how the lateral projections 4 on sup-porting insert 1 extend beyond the cable aperture and thus prevent the en-tire sealing system from moving axially. The arrangement shown is part-icularly satisfactory in that cables 6 face each other in pairs, but the supporting insert is inserted in such a manner that none of the cables is located in the parting plane of sealing elements 8. The pressure conditions wi~hin the sealing system are largely uniform. The arrangement is made clear in Figure 6 which is a section through supporting insert 1 and sealing elements 8 which are defined laterally by projections 4 on the supporting insert. Sealing compound 11 provides a gas-tight seal.
~, . ~ . .
., . . . ' ~ :~
.: ' ' . . . :
The invention relates to a supporting insert for sealing systems to facilitate the introduction of a plurality of cables into cable fittings, using a plastic sealing compound.
When cables are being installed in cable fittings, the seal be-tween the casing of the cable and the sleeve has an important f~Un~t~n~- Sub-stantial difficulties arise when several small-diameter cables are to be introduced side by side, or together, into a single aperture in the cable fitting. In such cases, sealing has hitherto been carried out with a fill-ing of sealing compound. As described in German OS 2 209 629, this may be facllitated to some extent by the insertion of preformed fillers. In the case of thermoplastic sleeves with la~inated seals, however~ ~here is a danger of the relatively flexible and soft casings of small-diameter cables being pinched between the laminations during the closing operation making it impossible to close the sleeve completely. Where cables having casings of this kind are introduced into large apertures, there is also a danger of improper sealing due to deformation of the cable casing~ especially in the case of mechanical stressing by tension, compression or bending.
Now the invention is concerned with the problem of introducing a plurality of small-diameter cables into a single aperture, and of ensuring that the cables, which have relatively flexible casings, are supported in the sealing area and are protected against tensile and compressive forces.
It is also the purpose of the invantion to ensure that the sealing system itself is protected against such stresses. ~cco~ding to the invention there is provided a supporting insert for sealing syskems to facilitate the in-sertion of a plurality of cables into a cable fitting~ said supporting in-' ;~
.,: . ~ , ................................. . . .
. : . . .
: . . :. : . . ..
.. . . .
'',': , ,. ,, ~ ~ . , ' :
,, . :, .. . .
i3~
sert being of basically cylindrical cross section corresponding to the diameter of the aperture in the sealing system in which it is to be placed, and having axial groove-like recesses extending inwardly from the periphery of the insert; thin-walled, break-away webs being arranged at each end of at least some of said recesses; radially outwardly directed projections being arranged at each end of the said supporting insert, the distance between the said projections corresponding to the axial length of the sealing system.
The main feature of the invention is that a plurality of cables of small diameter can now be introduced into a large-diameter aperture in a sealing systemO Because of the flexible and relati~ely soft casings, cables of this kind are at risk while being installed in laminated sealing systems, since the casings may be pinched in the parting plane of the sealing element. Furthermore~ the cable fitting cannot be completely closed and leaks therefore occur. This is prevented by the support mg insert according to the invention, since the cablesare laid in the reces-ses in the lnsert. These inserts also make it possible to introduce more -cables than with conventional assembly, since the insertion width is increased9 i.e. the number of insertions possible in the parting plane is increased. Since several cables can be intr-oduced, this means that, under certain circumstances, a smaller type of sleeve may be usedO Another advantage of the invention is that the sides of the recesses are initially closed off with thin-walled, break-away inserts or webs. It is thus un-necessary to fit cables in all of the apertures, since ~illers, made of circular materia~ for example, may be placed between these webs and with . .
~2--. . .
, . . . , ~ , . . .
-``` ~.~Si34~L
the sealing compound these provide a seal, as when a cable is introduced.
These webs also act as stops to prevent lateral movement of the fillers under the action of compressive forcesO The supporting inserts themselves may be prevented from moving axially by forces, such as arise jM pressur-ized cable fittings, by projections directed radially outwards~ These projections are attached to the ends of the inserts in such a manner that the sealing system, preferably in the form of the dividedrl sealing element of a thermoplastic sleeve, is locked to some extent therebetween the supporting insert being thus completely immobili~ed axially~
The invention will now be explained in greater detail, by way of example onLy, in conjunction with the six figures attached hereto~ wherein Figures 1 and 2 illustrate a supporting insert having four recesses for introducing cablesO Figures 3 and 4 illustrate a supporting insert having onLy one such re~e~sO Figure 5 shows the use of the support-ing insert in a longitudinally divided cable sleeve. ~igure 6, which is part section through Figure 5, shows the position of a supporting insert between the parts of the sealing element.
The cross-sectional view, in Figure 1, of a supporting insert 1 having four recesses 2 for the accommodation of small-diameter cables en-veloped in plastic sealing compound, shows the arrangement of grooye like recesses 2 extending inwardly from the periphery. In this example, two thin-walled~ break-away inserts or webs 3 are left in position at the ends of the supporting insert~ or in other words in this case the supporting insert is used to install only two cables~ the other two recesses being fitted with fillers (not shown). Inser~s or webs 3 prevent the fiL:Lers and , .. - . :
, ~
, ,'.,', , , the sealing compound ~rom moving. In the area of their fracture lines inserts or webs 3 have notches 5 defining a line of weakness to facilitate and locate the break. Outwardly-directed projections 4 extend radially from the supporting insert 1 and serve to position the insert within the sealing system, the lat~er being preferably in the form of a divided sealing element of a longitudinally-divided cable sleeve. It is thus impossible for axial forces to cause lateral movement of the insert.
Figure 2 shows the suppor~ing insert 1 having a visible recess 2 and having inserts or webs 3 at the ends and lateral projections ~0 The distance between projections 4~ and therefore the length of the sealing insert, is determined by the sealing system accommodating the insert. This also makes axial movemen~ of the entire sealing system impossible.
In ~igure 3~ supporting i~sert 12 has only one recess 13 and one out-wardly-directed projection 14. ~ side elevation of this embodiment is illustrated in Figure 4 which shows the location of the cross-section sho~m in Figure 30 This design is particularly sui~able for introducing a cable which is especially endangered, because of its flexibility, while being introduced into a cable apert~re between the parting planes of a sealing element. This supporting insert 12 is also very suitable for use as a ~0 closure element for a cut-out cable aperture~ in which case a filler~ made of circular material and enveloped in sealing compound, is inserted into the recess 130 In this case the lateral inser~s or webs 3 (not shown) in Figure 3 are not broken away.
Figure ~ shows the manner in which several small~dlameter cables 6 are inserted into the aper~lure in a sea]ing element by a means of a sup-':' -.
9S39~
porting insert 1 according to the invention. Longitudinally~divided cable sleeve 9~ which is closed by means of a clamping rail 10, has sealing ele-ments at each end in the form o~ semi-circular parts 8. Cable ~pertures are arranged in the parting plane between parts 8, one of these apertures containirlg a large-diameter cable 7 and the other containing a supporting insert 1 with four cables 6. Additional sealing is provided by sealing compound 11. The figure also shows how the lateral projections 4 on sup-porting insert 1 extend beyond the cable aperture and thus prevent the en-tire sealing system from moving axially. The arrangement shown is part-icularly satisfactory in that cables 6 face each other in pairs, but the supporting insert is inserted in such a manner that none of the cables is located in the parting plane of sealing elements 8. The pressure conditions wi~hin the sealing system are largely uniform. The arrangement is made clear in Figure 6 which is a section through supporting insert 1 and sealing elements 8 which are defined laterally by projections 4 on the supporting insert. Sealing compound 11 provides a gas-tight seal.
~, . ~ . .
., . . . ' ~ :~
.: ' ' . . . :
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A supporting insert for sealing systems to facilitate the in-sertion of a plurality of cables into a cable fitting said supporting in-sert being of basically cylindrical cross section corresponding to the diameter of the aperture in the sealing system in which it is to be placed and having axial groove-like recesses extending inwardly from the periphery of the insert; thin-walled, break-away webs being arranged at each end of at least some of said recesses; radially outwardly directed projections being arranged at each end of the said supporting insert, the distance be-tween the said projections corresponding to the axial length of the sealing system.
2. A supporting insert according to claim 1, wherein the break-away webs comprise notches along the fracture lines.
3. A supporting insert according to claim 1, wherein two recesses are arranged to face each other in pairs.
4. A supporting insert according to claims 1 or 2, having a single recess arranged asymmetrically.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG7733831.9 | 1977-11-03 | ||
| DE19777733831 DE7733831U1 (en) | 1977-11-03 | 1977-11-03 | Support insert for sealing systems for the introduction of several cables in cable accessories |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109534A true CA1109534A (en) | 1981-09-22 |
Family
ID=6684155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA315,784A Expired CA1109534A (en) | 1977-11-03 | 1978-11-03 | Supporting insert for sealing cables in cable fittings |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1109534A (en) |
| DE (1) | DE7733831U1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4725035A (en) * | 1985-06-28 | 1988-02-16 | Northern Telecom Limited | Apparatus for manufacture of sealing closures for a telecommunications cable splice |
| US5399811A (en) * | 1990-09-13 | 1995-03-21 | Walter Rose Gmbh & Co. Kg | Device for sealing cables entering a cable coupling sleeve |
| TWI384494B (en) * | 2009-11-13 | 2013-02-01 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3025766C2 (en) * | 1980-07-08 | 1982-10-21 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Cable entry for cable accessories |
| DE9107914U1 (en) * | 1991-06-27 | 1991-09-05 | Stewing Kunststoffbetrieb GmbH Dorsten i.K., 46282 Dorsten | Cable sleeve |
| GB9404396D0 (en) * | 1994-03-07 | 1994-04-20 | Raychem Sa Nv | Sealing arrangement |
-
1977
- 1977-11-03 DE DE19777733831 patent/DE7733831U1/en not_active Expired
-
1978
- 1978-11-03 CA CA315,784A patent/CA1109534A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4725035A (en) * | 1985-06-28 | 1988-02-16 | Northern Telecom Limited | Apparatus for manufacture of sealing closures for a telecommunications cable splice |
| US5399811A (en) * | 1990-09-13 | 1995-03-21 | Walter Rose Gmbh & Co. Kg | Device for sealing cables entering a cable coupling sleeve |
| AU657703B2 (en) * | 1990-09-13 | 1995-03-23 | Walter Rose Gmbh & Co. Kg. | Device for sealing cables entering a cable coupling sleeve |
| TWI384494B (en) * | 2009-11-13 | 2013-02-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE7733831U1 (en) | 1978-03-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |