WO1984004572A1 - Manchon retrecissable a la chaleur pour cables electriques et connexions de cables - Google Patents

Manchon retrecissable a la chaleur pour cables electriques et connexions de cables Download PDF

Info

Publication number
WO1984004572A1
WO1984004572A1 PCT/US1984/000536 US8400536W WO8404572A1 WO 1984004572 A1 WO1984004572 A1 WO 1984004572A1 US 8400536 W US8400536 W US 8400536W WO 8404572 A1 WO8404572 A1 WO 8404572A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
sleeve
edge
tabs
heat
Prior art date
Application number
PCT/US1984/000536
Other languages
English (en)
Inventor
Winfried Knorr
Original Assignee
Minnesota Mining & Mfg
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 Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Publication of WO1984004572A1 publication Critical patent/WO1984004572A1/fr

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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/006—Shrinkage connections, e.g. assembled with the parts being at different temperature
    • F16B4/008—Shrinkage connections, e.g. assembled with the parts being at different temperature using heat-recoverable, i.e. shrinkable, sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/10—Making preforms having internal stresses, e.g. plastic memory by bending plates or sheets
    • 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
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/1806—Heat shrinkable sleeves
    • H02G15/1813—Wraparound or slotted sleeves

Definitions

  • the invention relates to a heat-shrinkable sleeve for making an enclosure of an elongated article like an electrical cable, a cable connection, or the like, the collar comprising a heat-shrinkable sheet dimensioned to overlappingly enwrap the article, the sheet having interlocking elements on two opposite marginal portions destin ⁇ ed for mutual overlapping, which elements are adapted to be brought into positive interengagement after the sheet has been wrapped around the article and which then form a closure that holds the sleeve to ⁇ gether against the forces which will arise in the shrinking.
  • the prior art includes the heat-shrinkable sleeve of U.S. Patent No. 3,379,219 in which the interlocking elements consist of button-like protrusions and holes mating therewith. It has been found that a closure buttoned in this way will too easily become inadvertently disengaged upon shrinking under the influence of the high shrinking forces and as a consequence of the softening of the sheet material. Moreover, sheets having button-like protrusions cannot be manufactured by extruding as well as cutting and/or stamp ⁇ ing. That mode of manufacture, however, is highly desirable because of the much reduced cost, particularly for the extruding. Therefore, extruded sheets without button-like protrusions are employed in other known sleeves.
  • the closure is then formed, for instance, by clamps clamped onto the edges of the sheet as in U.S. Patents Nos. 3,455,336 and 4,123,047 and German disclosure 2938 270.
  • clamps of suitable size available at the site of application.
  • the manufacture of the sleeves requires a con- siderable expense of labor at the site of operation; moreover the result obtained is highly dependent upon the care and skill of the manufacturing personnel.
  • the heat-shrinkable sleeve of U.S. Patent No. 3,574,313 is formed by inwardly folded, mutually overlaid marginal portions, with the one marginal portion having pre-shrunk tabs which are in ⁇ serted into slots of the other marginal portion.
  • Such a closure is difficult to close and has little strength; in particular, the tabs can be easily drawn out of the slots in the circumferential direction under the action of the high shrinking forces.
  • German disclosure 2938270 the overlapping marginal portions are provided with pressure sensitive adhesive tape and adher ⁇ ed to each other by pressing together. In this case, the subsequent shrinking must not include the marginal portions. With such a foil section of material which shrinks only partly, it is difficult to obtain a smooth closure seam. Also, the manufacture of such partly shrinkable sheets is relatively expensive.
  • the present invention provides a heat-shrinkable sleeve formed from an extruded sheet in which the interlocking elements comprise, in the one marginal portion, a row of tabs cut from the edge, each tab having a base portion and a lock portion extending therefrom, the lock portion having a greater length in the direction of the edge than the base portion, and in the other marginal portion, a row of longitudinal slots associated one with each of the tabs in the first row and being dimensioned and arranged for the passage therethrough of the base portions of the tabs, and in that the longi ⁇ tudinal slot is accessible.via a transverse slot extending from the edge.
  • Figure 1 is a perspective partial view of a heat-shrinkable sleeve according to the invention prior to the closing and shrinking thereof;
  • Figure 2 is a partial view of the sleeve shown in Figure 1 after.the closing thereof;
  • Figure 3 is a view similar to that of Figure 1 , of a second embodiment;
  • Figure 4 is an extruded heat-shrinkable sheet for a third embodiment of a sleeve according to the invention;
  • Figure 5 is a perspective view of a sleeve made from the sheet of Figure 4;
  • Figure 6 is a perspective view of an enclosure made from the sleeve of Figure 5 by heat-shrinking;
  • Figure 7 is a perspective view of a fourth embodiment of a heat-shrinkable sheet for a sleeve according to the invention.
  • Figure 8 is a cross-sectional view, along line VI11-VI11 of Figure 7 of a sleeve made from the sheet of Figure 7, wherein a reinforcing strip has been added;
  • Figure 9 is a transverse cross-sectional view of a fifth embodiment, similar to that of Figure 7, but having reinforced margi ⁇ nal areas;
  • Figure 10 is a partial cross-sectional view like that of Figure 8, of a sleeve made from the sheet of Figure 9;
  • Figure 11 is a cross-sectional view of a sixth embodiment which is basically similar to that of Figure 7 but has reinforced marginal areas of a cross-section different from that shown in Figure 9;
  • Figure 12 is a partial cross-sectional view of a sleeve made with the sheet of Figure 11;
  • Figure 13 is a cross-sectional view of a seventh embodiment of a heat-shrinkable sheet which is similar to that of Figure 11; and Figure 14 is a partial cross-sectional view of a sleeve made from the sheet of Figure 13.
  • Figure 1 illustrates a heat-shrinkable sleeve 1 for making an enclosure of an elongated article 3, such as an electrical cable, comprising a heat-shrinkable sheet 5 dimensioned to overlappingly enclose the article 3, the sheet having interlocking elements on two opposite marginal portions 7 and 9 destined for mutual overlap ⁇ ping.
  • the interlocking elements on one marginal portion 7 consist of a row of tabs 11 cut from the edge, each having a base portion 13 and a lock portion 15 extending therefrom.
  • the lock portion 15 has, in the direction 17 of the edge, a greater length than the base portion 13.
  • the interlocking ele ⁇ ments consist of a row of longitudinal slots 19, one slot correspond ⁇ ing to each tab in the first row.
  • Each of the longitudinal slots 19 is accessible through a transverse slot 21 extending from the edge.
  • the longitudinal slots 19 are dimensioned and arranged so as to be transversed by the base portions 13 of the opposed related interlocking tabs 11.
  • the longitudinal slots 19 each have a width b measured transversely of the edge, which is smaller than the width B of the lock portion 15 as measured transversely of the edge.
  • the width b of the longitudinal slot is the same as, or slightly greater than, the sheet thickness of the base portion 13.
  • Figure 2 illustrates the sleeve of Figure 1 in the closed condition.
  • the row of tabs 15 has to be inserted, one after the other, each through the associated transverse slot 21 and longitudinal slot 19 by flexing the sheet material.
  • the marginal areas of the marginal portion 9 between adjacent slots 19 form tabs 23 which have the same function as the tabs 15.
  • Figure 3 illustrates a second embodiment of a sleeve 301 in which tabs 315, 323 are provided on both margianl portions 307 and 309.
  • a particularly complete overlapping is achiev ⁇ ed in that on both edges a row of tabs 315, 323, a row of longitudinal slots 319 and 325, respectively, and a row of transverse slots 321 and 327, respectively, is formed due to the fact that the marginal areas left between the longitudinal and transverse slots from tabs 315 and 323, respectively.
  • Figures 4 through 6 illustrate a third embodiment of a sleeve 401 according to the invention, in which again both marginal portions 407 and 409 are the same and each comprises a row of tabs and longitudinal and transverse slots 419, 425.
  • the longitudinal slots 419, 425 have rounded contours; thereby, the assembly is facili ⁇ tated, and the sleeve adapts itself better to local differences in thickness of the article to be enclosed.
  • the longitudinal slots are provided in the form of circular open ⁇ ings.
  • the sheet is reinforced along each edge by each a unitary marginal ledge 429 and 431, respectively.
  • Figures 7 and 8 illustrate a fourth embodiment in which the sleeve is formed from a sheet 705 of uniform thickness.
  • a reinforcement is formed in the area of the tabs and longitudinal slots by a reinforcing strip 733 attached to the sheet (see Figure 8).
  • the reinforcing strip 733 which must be heat-resistant and for instance may have a fiber glass reinforce ⁇ ment, may be adhesively attached on the closure area 735, for instance by means of a ther osetting plastic adhesive.
  • Figures 9 and 10 illustrate a fifth embodiment wherein the sheet 905 is similar to the sheet 705 of Figure 7, but differs in that it is reinforced by thickenings 939 and 941 in the area of the tabs and longitudinal slots. The thickening is appropriately dimensioned so that it about compensates for the reduction in strength caused by the slots in the marginal portion of the sheet 905.
  • Figures 11 and 12 illustrate a sixth embodiment of a sheet 1105 which again is similar to that of Figure 7, and like that of Figures 9 and 10 is reinforced in its marginal portions by thickenings 1139 and 1141. These, however, are formed so that an essentially round, bead-like seam will result in the connection area 1135 upon the closing of the sleeve (see Figure 12).
  • Figure 13 and 14 illustrate an embodiment like that of Figures 11 and 12 except that the sheet 1305 has been extruded to include a unitary sealing lip 1343 which underlies the one marginal portion 1341.
  • that sealing lip 1343 is left unchanged so that a continuously satisfactory sealing will result in the connecting area 1335 in the closed condition of the sleeve 1301 (see Figure 14) due to the fact that the whole closure is underlaid by the sealing lip 1343.
  • a heat-shrinkable sheet material is extruded, heated for purposes of cross-linking, stretched and cooled in the stretched condition, , the sheet being cut out and being provided with the inter- locking elements in the form of the tabs and the longitudinal and transverse slots by means of cutting and/or stamping.
  • extrudable sheet materials of different kind are suited.
  • cross-linked poly ⁇ ethylene is particularly well suited, which can be stretched and shrunk by about 300 to 400%.
  • Materials of that kind have good emer ⁇ gency proeprties, i.e. they can withstand overheating up to 250° for short periods of time without becoming damaged or permanently deformed.
  • materials of that kind are available at a rela ⁇ tively low price.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cable Accessories (AREA)
  • Insulating Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

Un manchon rétrécissable à la chaleur pour la réparation de gaines de câbles électriques et pour recouvrir des connexions de câbles comporte une feuille flexible (5) extrudée rétrécissable à la chaleur possédant une rangée de pattes (11) le long d'un bord et une rangée correspondante de fentes longitudinales (19) près du bord opposé. Les pattes possèdent chacune une base réduite et une partie terminale plus grande si bien que la base s'ajuste dans une fente longitudinale et que la partie terminale plus grande s'engage avec la feuille de matériau entourant la fente. Une fente transversale (21) s'étend entre chaque fente longitudinale et le bord adjacent de la feuille pour permettre l'insertion de la base de chaque patte dans la fente longitudinale correspondante afin de bloquer les bords de la feuille pour former un manchon.
PCT/US1984/000536 1983-05-13 1984-04-09 Manchon retrecissable a la chaleur pour cables electriques et connexions de cables WO1984004572A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833317379 DE3317379C2 (de) 1983-05-13 1983-05-13 Wärmeschrumpfbare Manschette für elektrische Kabel und Kabelverbindungen

Publications (1)

Publication Number Publication Date
WO1984004572A1 true WO1984004572A1 (fr) 1984-11-22

Family

ID=6198840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1984/000536 WO1984004572A1 (fr) 1983-05-13 1984-04-09 Manchon retrecissable a la chaleur pour cables electriques et connexions de cables

Country Status (4)

Country Link
EP (1) EP0147416A1 (fr)
AU (1) AU2824884A (fr)
DE (1) DE3317379C2 (fr)
WO (1) WO1984004572A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503463A1 (fr) * 1991-03-15 1992-09-16 RXS Schrumpftechnik-Garnituren GmbH Procédé de fabrication d'éléments thermorétractables et éléments obtenus par ce procédé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4032376A1 (de) * 1990-10-12 1992-04-16 Aei Ges Fuer Automatik Elektro Schrumpfschlauch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU154745A1 (fr) *
US3208478A (en) * 1962-03-30 1965-09-28 Alec Sabin Baines Plastic drainage tube
US3574313A (en) * 1968-10-30 1971-04-13 Raychem Corp Wraparound closure sleeve
US4371578A (en) * 1979-07-27 1983-02-01 A. C. Egerton Limited Heat shrinkable material for wrapping around a pipe, cable or the like
US4442154A (en) * 1981-09-09 1984-04-10 Siemens Aktiengesellschaft Longitudinally split sleeve

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379218A (en) * 1965-07-29 1968-04-23 Raychem Corp Closure sleeve for pipes or the like
US3455336A (en) * 1965-11-03 1969-07-15 Raychem Corp Heat recoverable article and process
US3530898A (en) * 1968-10-30 1970-09-29 Raychem Corp Closure sleeve
GB1561125A (en) * 1975-08-04 1980-02-13 Raychem Sa Nv Heat recoverable article
GB1506242A (en) * 1976-09-17 1978-04-05 Coal Ind Fastener device
US4123047A (en) * 1976-12-15 1978-10-31 Raychem Corporation Modular clip assembly for heat shrinkable material
US4268559A (en) * 1978-09-22 1981-05-19 Electronized Chemicals Corporation Heat-shrinkable article
DE3201108A1 (de) * 1982-01-15 1983-07-28 Siemens AG, 1000 Berlin und 8000 München Verschlusssystem fuer eine manschette aus schrumpfbarem material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU154745A1 (fr) *
US3208478A (en) * 1962-03-30 1965-09-28 Alec Sabin Baines Plastic drainage tube
US3574313A (en) * 1968-10-30 1971-04-13 Raychem Corp Wraparound closure sleeve
US4371578A (en) * 1979-07-27 1983-02-01 A. C. Egerton Limited Heat shrinkable material for wrapping around a pipe, cable or the like
US4442154A (en) * 1981-09-09 1984-04-10 Siemens Aktiengesellschaft Longitudinally split sleeve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503463A1 (fr) * 1991-03-15 1992-09-16 RXS Schrumpftechnik-Garnituren GmbH Procédé de fabrication d'éléments thermorétractables et éléments obtenus par ce procédé

Also Published As

Publication number Publication date
DE3317379C2 (de) 1986-08-14
DE3317379A1 (de) 1984-11-15
AU2824884A (en) 1984-12-04
EP0147416A1 (fr) 1985-07-10

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