Cable splice closure and strain relief

• US 4,581,480 A
• Filed: 09/07/1984
• Issued: 04/08/1986
• Est. Priority Date: 09/07/1984
• Status: Expired due to Term

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Charlebois, Leonard J.
• Primary Examiner(s): Grimley, A. T.
• Assistant Examiner(s): NIMMO, MORRIS
• Application Number:
  US06/648,461
• Time in Patent Office: 578 Days
• Field of Search: 174/76, 174/84 R, 174/88 R, 174/91, 174/92, 174/93, 174/21 R, 156/49, 156/56
• US Class Current: 174/84.00R
• CPC Class Codes: H02G 15/007 Devices for relieving mechanical stress
• CPC Class Codes: H02G 15/117 for multiconductor cables

Abstract

Cable splice and closure arrangement to cover a cable region which is devoid of sheath and jacket. At each side of the devoid region, the cable has a strap member encircling it and piercing means of the strap member protrude through the jacket and into the sheath at spaced positions around the cable. An outwardly projecting means of each strap member is intimately embedded in a moulded plastic end of a combined closure and tensile strength means. This combined means may be an integral moulding having the two ends and a portion between the ends and which bridges the devoid region. Alternatively, it may comprise individual moulded plastic ends with tensile means such as steel rods extending between the embedded in the ends. The invention also includes a strain relief device for inclusion in the splice and closure arrangement.

Claims

1. A cable splice and closure arrangement in which conductors span a region between two cable sections of cables both having a jacket and sheath, said region being devoid of a cable jacket and metallic sheath, the arrangment provided with a combined closure and tensile strength means and with two strain relief devices, one encircling each cable section, each strain relief device comprising:

a strap member having radially inwardly extending piercing means which protrude through the jacket and into the sheath at circumferentially spaced positions around the cable, and radially outward projecting means; and

wherein the combined closure and tensile strength means includes;

moulded plastic ends which intimately surround end portions of the cable sections with the projecting means intimately embedded in the plastic ends to transfer tensile load from the cable sections into the plastic ends; and

bridging means extending between the plastic ends to enclose spliced together conductors in the arrangement and to carry tensile loads from one plastic end to the other.

2. An arrangement according to claim 1 wherein each strap member has a base having a certain width laterally of the strap member and with piercing means pressed in one direction from the base.

3. An arrangement according to claim 2 wherein the projecting means comprise flange means extending from edges of the base in the other direction.

4. An arrangement according to claim 2 wherein each strap member is held to the cable by a clamp having a flexible strip encircling the base and a screw thread means for tightening the strip around the base to force it onto the cable.

5. An arrangement according to claim 1 wherein the bridging means is a moulded axially extending part of the closure which extends between and is integrally moulded with the plastic ends, said axially extending part also provided to carry tensile loads from one plastic end to the other.

6. An arrangement according to claim 1 wherien the bridging means comprises a shroud means which extends between the plastic ends and is sealed thereto to enclose the spliced together conductors, the bridging means also comprising a plurality of tensile strength members which are spaced apart circumferentially of the arrangement, extend axially and are secured to the plastic ends.

7. An arrangement according to claim 6 wherein the shroud means comprises a flexible sheet material wrapped around the devoid region to form a sleeve which is sealingly mounted around the plastic ends.

8. A method of making a cable splice and closure arrangement comprising:

providing two sections of cables both having a jacket and sheath, the sections spaced by a cable region which is devoid of a cable jacket and metallic sheath and with conductors extending from at least one of the sections, spliced to other conductors;

locating a strain relief in the form of a strap member around each cable section with piercing means of the device protruding through the cable jacket and into the sheath and with projecting means extending outwardly from the jacket; and

providing a combined splice closure and tensile strength means by moulding plastic ends of the closure and tensile strength means, with one plastic end surrounding and in intimate engagement with each cable section to intimately embed the projecting means in the plastic end, and bridging between the plastic ends to enclose spliced together conductors in the arrangement and to carry tensile loads from one plastic end to the other.

9. A method according to claim 8 comprising bridging between the plastic ends by moulding an axially extending part of the closure integrally with and extending between the plastic ends, the axially extending part also provided to carry the tensile loads.

10. A method according to claim 8 comprising bridging between the plastic ends by providing a plurality of tensile strength members in spaced-apart positions circumferentially of the arrangement and extending axially to the position of the plastic ends, then moulding the plastic ends while securing the strength members to the plastic ends, and bridging between the plastic ends by disposing a shroud means between the plastic ends and sealing the shroud means to the plastic ends to enclose the spliced together conductors.

11. A method according to claim 10 wherein the tensile strength members have parts which are embedded into the plastic ends as the ends are being moulded.