Protection of cable splice

• US 4,648,919 A
• Filed: 08/15/1985
• Issued: 03/10/1987
• Est. Priority Date: 09/18/1984
• Status: Expired due to Fees

• Current Assignee: Raychem Corporation (TE Connectivity Limited)
• Original Assignee: Raychem Corporation (TE Connectivity Limited)
• Inventors: Shimirak, Gerald L., Humphries, William H., Lawrence, Alvah A., Diaz, Stephen H., Debbaut, Christian A. M., Ragland, Glen W.
• Primary Examiner(s): Dawson, Robert A.
• Application Number:
  US06/769,781
• Time in Patent Office: 572 Days
• Field of Search: 156/48, 156/49, 156/53, 156/56, 174/23 R, 174/76, 174/88 R, 174/92, 428/36, 428/137, 428/304.4, 428/913
• US Class Current: 156/48
• CPC Class Codes: G02B 6/4476 with heat-shrinkable elements
• CPC Class Codes: H02G 15/003 Filling materials, e.g. solid or fluid insulation
• CPC Class Codes: H02G 15/117 for multiconductor cables
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture

Abstract

A splice between two multiconductor cables is protected from ingress of water by a closure which is filled with a sealant which is pressurized by a bladder inside the closure to a pressure sufficient to force the sealant into the interstices of the splice and the interstices between the conductors in the cable, and the pressure is maintained by the bladder until the sealant cures or hardens.

Claims

1. An apparatus for protecting a splice connecting at least two multi-conductor electrical cables from ingress of water which comprises:

(a) a closure for enclosing the splice and forming a seal to the cable jackets thereby forming an enclosed area for the splice and the cable ends; and

(b) pressure means comprising a heat expandable material which can be activated by heat or electric current from outside the closure which pressure means is inside the enclosed area and capable of applying sufficient pressure to a liquid sealant in the enclosed area to force the liquid sealant to penetrate into the splice and the interstices between the conductors in the cables.

2. An assembly comprising:

(a) a splice connecting at least two multi-conductor electrical cables;

(b) a closure capable of maintaining pressure enclosing the splice and forming a seal to the cable jackets thereby forming an enclosed area for the splice and the cable ends;

(c) sufficient hardenable liquid sealant in the enclosed area to essentially fill the enclose area; and

(d) pressure means positioned inside the enclosed area and capable of applying sufficient pressure to the liquid sealant in the enclosed area to force the liquid sealant to penetrate into the splice and the interstices between the conductors in the cables and capable of being activated and controlled from outside the closure;

whereby the splice is protected from ingress of water.

3. An assembly according to claim 2, wherein the pressure means is a heat expandable material which can be activated by heat or electric current from outside the closure.

4. An assembly according to claim 2 wherein the pressure means is a flexible bladder which can be pressurized with a fluid from outside the closure.

5. A method for protecting a splice connecting at least two multiconductor electrical cables from ingress of water which comprises:

(a) positioning a closure about the splice and sealing the closure to the cable jackets to form an enclosed area for the splice and the cable ends wherein the closure has an opening for introducing sealant into the enclosed area and a pressure means in the enclosed area for applying pressure to the liquid sealant;

(b) introducing a hardenable liquid sealant into the enclosed area thereby displacing the air from the enclosed area;

(c) closing the opening; and

(d) pressurizing the pressure means to a pressure sufficient to force the liquid sealant to penetrate into said splice and into the interstices between the conductor in the cables; and

(e) maintaining said pressure in the enclosed area for a period of time to permit the liquid sealant to harden.