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Publication numberUS3812282 A
Publication typeGrant
Publication dateMay 21, 1974
Filing dateJan 11, 1973
Priority dateJan 11, 1973
Publication numberUS 3812282 A, US 3812282A, US-A-3812282, US3812282 A, US3812282A
InventorsJohansson J
Original AssigneeInt Standard Electric Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tearable insulation sheath for cables
US 3812282 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

0 United States Patent 11 1 1111 ,812,282 Johansson May 21, 1974 1 1 TEARABLE INSULATION SHEATH FOR T 2.927952 3/1960 Wermine 174/113 AS X CABLES 3,748,371 7/1973 Krook et a1. 174/70 R [75] Inventor: Johan A. E. Johansson, Grimsas, FOREIGN PATE TS O PPLICATIONS S eden 1.072021 3/1954 France 174/136 725,624 3/1955 Great Britain..... [73] Asblgnee' lmemamfnal Standard Elem 887,029 1/1962 Great Britain 174/15 c Corporation, New York, NY.

1 Filedl Jan. 11, 1973 Primary Examiner-Laramie E. Askin Attorney, Agent, or Firm-John T. OHalloran; Me- [211 Appl' 32266l notti .1. Lombardi, Jr.; Edward Goldberg [52] US. Cl. 174/68 C, 174/10, 11774 7171031: [57] ABSTRACT 51 Int. Cl. H01b 7/00, H02g 1/12 A cable sheath includes a p of Parallel longitudinal 58 Field of Search 174/10, 15 c, 47, 68 c, depressions and a rim Iherebetween to Provide a 174/70 R, 104 113 5 117 5 13 3 R plified accessible cutting web for manually splitting 113 R, 115 117 R, 117 F open the cable. The depressions can be on the inner or outer surfaces or both and the rim may include a 5 References Cited wire thread and a raised outer surface to facilitate the UNITED STATES PATENTS 290375 12/1883 Waring 174/113 AS X 4 Claims, 5 Drawing Figures I TEARABLE INSULATION SHEATI-I FOR CABLES BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention refers to a cable having a tearable sheath which protects and encloses one or more conductors. In particular, a novel structure is provided which facilitates tearing of the sheath.

2. Description of the Prior Art For many types of cable an important part of the cable sheath has to be removed during installation. In previously known constructions a cutting thread has been enclosed within the sheath for this purpose. In order to cut the sheath open, the cutting thread must be accessible and is then utilized as a cutting device to tear the sheath and remove a desired length. In addition, to facilitate cutting of the cable sheath, weakened sections have been included in the sheath. The cutting thread is then arranged within the sheath so that the cutting can take place along the weakened sections.

In the known cable cutting arrangements, however, it has proven difficult to rapidly locate the cutting thread positioned under the sheath. In order to gain access to the thread it has often been necessary to cut open a length of the cable sheath by use of special cutting tools or knives. When the used cable is very short there is also a risk that the cutting thread will slide relative to the sheath and the conductors of the cable and this cancels the desired cutting effect.

SUMMARY OF THE INVENTION These drawbacks associated with the known tearable cable sheath constructions are eliminated in the present invention by utilizing a cutting rim integral with the cable sheath along the length thereof. The tearing of the sheath along the cutting rim is facilitated by applying strain from the center line of the cable and by the use of longitudinal grooves on each side of the rim. The invention will be described more in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. lshow, in section, different embodiments of a cable having a tearable sheath in accordance with the present invention.

The same reference numerals are used in all the Figures to designate similar details. The relative dimensions of the parts illustrated in the Figures do not necessarily correspond with actual dimensions.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cable disclosed in the Figures includes an enclosed inner area 1 which may include one or more conductors. In case several conductors are utilized, each conductor is enclosed in a separate insulation layer. The inner portion 1 of the cable including the conductors, is enclosed in an outer protecting cable sheath 2.

As shown in FIG. 1, the inside of the cable sheath 2 facing the inner portion 1 includes two depressions or grooves 3 in the surface running parallel and extending along the whole length of sheath 2. The distance between the depressions 3 is relatively small and the portion 4 formed therebetween constitutes a cutting rim. When tearing the cable sheath 2, it is normally very simple to gain access tothe cutting rim 4 from the open cut end of the cable and to tear the sheath along the depressions 3. If, due to the shape of the depression, it is difficult to directly grip and lift the cutting rim 4 by hand, the operation can be facilitated by use of a tool which is inserted into one or both of the depressions adjacent the rim.

In FIG. 2 the cable sheath is so designed that there are also depressions 3 in the outside surface of the sheath. The outer depressions 3 are positioned just opposite the inner depressions such that the cutting rim 4 is bounded on respective sides by two webs 5. This structure permits very easy tearing, due to the distinct notches in the sheath. The cutting rim 4 can also be reinforced by a metal wire 6, a synthetic yarn or some other suitable material which is enclosed in the rim. Such a design is shown in FIG. 3.

In a modified design of the invention there is a longitudinal relatively wide outer notch 7 opposite the inner cutting rim 4. An arrangement including such a notch is shown in FIG. 4.

In order to further facilitate access to the cutting rim 4 shown in FIG. 2, the rim may include a widened extension 8 on the outside of the sheath -2, as shown in FIG. 5. This arrangement also makes it possible to grip the cutting rim 4 from the outside of the sheath 2. The cutting rim 4 of FIG. 5 also includes a reinforcing wire such as shown in FIG. 3. Many other variations are possible. For example, the cutting rim arrangement disclosed in FIG. 4 may be reversed such that the narrow depressions are positioned on the outside of the sheath and the wider notch on the inside thereof.

While only a limited number of embodiments have been illustrated and described, it is apparent that many other variations may be made in the novel design and configuration without departing from the scope of the invention as set forth in the appended claims.

What is claimed is:

I. A tubular sheath of insulation for cables comprising an inner tubular surface of insulating material surrounding a central coaxial area adapted to accommodate a plurality of insulated conductors, an exposed outer tubular surface of said insulating material, a pair of closely spaced parallel longitudinal grooves along one of said surfaces, a raised longitudinal surface portion disposed between said grooves, and a further longitudinal groove along the other of said surfaces opposite said parallel grooves, the portions of said insulating material between said grooves on opposite surfaces being of reduced thickness with respect to other portions of said material, said reduced thickness material between said opposite grooves being sufficiently thin to permit the tearing of the tubular insulation sheath along said pair of grooves and provide access to said insulated conductors.

2. The device of claim 1 including a second pair of closely spaced parallel grooves along said other surface opposite the first said pair of grooves, said second pair including said further groove, said opposite pairs of grooves forming a pair of thin webs between said inner and outer surfaces and a thick raised portion between said webs.

3. The device of claim 2 including a non-conducting longitudinal thread enclosed within said thick raised portion, said thread being for facilitating the manual tearing of said insulation sheath along said grooves.

4. The device of claim 3 wherein said thick raised portion includes a rim portion extending outwardly beyond said outer surface.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent 3.812.282 tDated M31 21, 1974 lnv fl Johan A. E. Johansson It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the Title page, insert E323 Priority January 17, 1972 Sweden I Signed and sealed this 8th day of October1974.

(SEAL) Attest:

McCOY M. GIBSON JR. c. MARSHALL DANN Commissioner of Patents Attesting Officer U 5, GOVLHNHENY PRINYING OFFICE-196'] L ,H'I'Jll FORM PC1-1050 (10-69) UNITED STATES PATENT OFFICE I CERTIFICATE OF CORRECTION Patent No. 3,812,282 Dated Mai 21, 1974 lnv n fl Johan A; E; Johenson It is certified that error appears in the Jabove-identifiedpatent and that said Letters Patent arefhereby corrected as shown below:

On the Title page, insert [323 Pfiority January 17, 1 972 Sweden I Signed and sealed this 8th day of October1974m (SEAL) Attest: MCCOY M. GIBSON JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents ORV. FED-1050 (10-69)

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3949156 *Dec 11, 1974Apr 6, 1976Hitachi Cable LimitedFloor cable with folded portions for making branch connections and method of producing same
US4237337 *Jun 1, 1978Dec 2, 1980Telefonaktiebolaget L M EricssonCable with wire for slitting a protective sheath and process of manufacturing same
US4296157 *Mar 22, 1979Oct 20, 1981Conti Allen CTube with weakened side wall segment
US4404425 *Dec 5, 1980Sep 13, 1983Thomas & Betts CorporationCable assembly for undercarpet signal transmission
US4591137 *Oct 26, 1984May 27, 1986Bayerische Motoren Werke, AgProtective covering for the piston of a telescoping spring element
US5027864 *Nov 3, 1989Jul 2, 1991Arnco CorporationTubular apparatus for transmission cable
US5042904 *Jul 18, 1990Aug 27, 1991Comm/Scope, Inc.Communications cable and method having a talk path in an enhanced cable jacket
US5212349 *Mar 22, 1991May 18, 1993Kabelwerk Eupen AgCable duct with detector wire
US5796046 *Jun 24, 1996Aug 18, 1998Alcatel Na Cable Systems, Inc.Communication cable having a striated cable jacket
US5844169 *Aug 9, 1996Dec 1, 1998Sumitomo Wiring Systems, Ltd.Wire duct with a weakened and readily deformable wall for displacing wires held within
US6545222 *Jan 9, 2001Apr 8, 2003Sumitomo Electric Industries, Ltd.Cable, and method for removing sheath at intermediate part of cable
US7214880Mar 14, 2003May 8, 2007Adc IncorporatedCommunication wire
US7238886Mar 1, 2004Jul 3, 2007Adc IncorporatedCommunication wire
US7271344Mar 9, 2006Sep 18, 2007Adc Telecommunications, Inc.Multi-pair cable with channeled jackets
US7511221Mar 31, 2005Mar 31, 2009Adc IncorporatedCommunication wire
US7511225Sep 8, 2003Mar 31, 2009Adc IncorporatedCommunication wire
US7560648May 3, 2007Jul 14, 2009Adc Telecommunications, IncCommunication wire
US7629536Aug 10, 2007Dec 8, 2009Adc Telecommunications, Inc.Multi-pair cable with channeled jackets
US7759578May 20, 2008Jul 20, 2010Adc Telecommunications, Inc.Communication wire
US7816606Jul 11, 2008Oct 19, 2010Adc Telecommunications, Inc.Telecommunication wire with low dielectric constant insulator
US8022302Jul 1, 2009Sep 20, 2011ADS Telecommunications, Inc.Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same
US8237054Sep 18, 2009Aug 7, 2012Adc Telecommunications, Inc.Communication wire
US8246287Feb 27, 2008Aug 21, 2012Westendorf Manufacturing, Co.Guard structure for fluid conduits of hydraulic cylinders and hydraulic lines
US8408862Sep 11, 2009Apr 2, 2013Westendorf Manufacturing Co., Inc.Guard structures for hydraulic cylinders, hydraulic lines, and loader arms
US8525030Aug 31, 2011Sep 3, 2013Adc Telecommunications, Inc.Communication wire
US8624116Aug 31, 2011Jan 7, 2014Adc Telecommunications, Inc.Communication wire
US8641844Sep 19, 2011Feb 4, 2014Adc Telecommunications, Inc.Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same
US8664531Mar 27, 2009Mar 4, 2014Adc Telecommunications, Inc.Communication wire
US20100132973 *Jun 26, 2006Jun 3, 2010Jonathan Gerald FitzElectrical power cable with frangible insulation shield
EP0018757A1 *Apr 18, 1980Nov 12, 1980W.L. GORE & ASSOCIATES, INC.Improvements in and relating to conductive cables, and method of slitting a plastic jacket of a conductive cable
Classifications
U.S. Classification174/68.3, 138/173, 138/121, 174/10, 174/113.00R, 138/172, 174/70.00R
International ClassificationH01B7/40, H01B7/00, H01B7/38
Cooperative ClassificationH01B7/40, H01B7/38
European ClassificationH01B7/40, H01B7/38
Legal Events
DateCodeEventDescription
Mar 19, 1987ASAssignment
Owner name: ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE;REEL/FRAME:004718/0023
Effective date: 19870311