Protected electrical connector

• US 5,357,057 A
• Filed: 08/21/1992
• Issued: 10/18/1994
• Est. Priority Date: 10/12/1982
• Status: Expired due to Fees

• Current Assignee: Tyco Electronics Corporation (TE Connectivity Ltd. (United Kingdom))
• Original Assignee: Raychem Limited (TE Connectivity Limited)
• Inventors: Debbaut, Christian A. M.
• Primary Examiner(s): SPARKS, DONALD ALAN
• Application Number:
  US07/933,285
• Time in Patent Office: 788 Days
• Field of Search: 29/855, 29/858, 29/868, 29/749, 29/871, 29/872, 29/862, 174/76, 174/84 C, 174/84 R, 174/87, 174/85, 174/88 G, 174/92, 174/93, 524/157, 524/267, 524/491, 524/848
• US Class Current: 174/84.00R
• CPC Class Codes: H01B 17/60 Composite insulating bodies
• CPC Class Codes: H01R 4/22 End caps, i.e. of insulating or conductive material for covering or maintaining connections between wires entering the cap from the same end
• CPC Class Codes: H01R 4/70 Insulation of connections end caps H01R4/22
• CPC Class Codes: H01R 4/72 using a heat shrinking insulating sleeve
• CPC Class Codes: H02G 15/003 Filling materials, e.g. solid or fluid insulation
• CPC Class Codes: H02G 15/043 with end caps, e.g. sleeve closed at one end
• CPC Class Codes: H02G 15/10 protected by boxes, e.g. by distribution, connection or junction boxes
• CPC Class Codes: H02G 15/18 protected by sleeves, e.g. for communication cable two-part covers H02G15/10 ; preforms having internal stresses B29C61/00
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence

Abstract

An apparatus and method for protection of electrical contacts as well as a process for splicing electrical wires that are to be exposed to an adverse environment. The protection apparatus ensures that the electrical contacts are protected when they are otherwise located in an adverse environment. In a particular embodiment, the apparatus includes a connector, an insulating sleeve adapted to retain the connector, and an encapsulant. The encapsulant, which is disposed with protection apparatus, e.g. the insulating sleeve, has a cone penetration value of 100 to 350 (10^-1 mm) and an ultimate elongation of at least 200% and preferably an elastic modulus of less than 10⁷ dynes/cm².

Claims

1. A device for protecting an electrical contact and wire connection, comprising:

(1) a gel formed prior to making the connection between the electrical contact and wire, said gel having an elastic modulus of less than 10⁶ dynes/cm², an ultimate elongation of at least 200%, and is capable of undergoing elastic deformation around the electrical contact and wire;

(2) a container for the gel; and

(3) a force member adapted to cooperate with and act on said container to move the container and gel from a first position to a second position whereby upon connection of the electrical contact and wire said gel within the container is elastically deformed and maintained in direct engagement with said electrical contact and wire so that said electrical contact and wire connection is environmentally sealed.

2. The device according to claim 1 wherein said gel is initially formed in contact with said container and said gel has a cone penetration of 150 to 350 (10^-1 mm).

3. The device according to claim 2 wherein the elastic modulus of said gel is less than 10⁵ dyne/cm².

4. The device according to claim 3 wherein said container includes an electrical contact and said gel, said gel having an adhesive strength to the wire to be sealed which is less than the gel'"'"'s cohesive strength.

5. The device according to claim 1 wherein said container houses an electrical contact and where said force member comprises in part a bolt member acting in combination with said container.

6. The device according to claim 5 wherein said gel has a cone penetration of 150 to 350 (10^-1 mm).

7. The device according to claim 6 wherein the electrical contact is an insulation displacement electrical contact contained within said container.

8. A device for protecting an electrical contact and wire connection, comprising

(1) a gel formed prior to making the connection between the electrical contact and wire, said gel having an elastic modulus of less than 10⁶ dynes/cm², and an ultimate elongation of at least 200%;

(2) a container for the gel; and

(3) a force member adapted to cooperate with and act on said container to move the container and gel or an electrical contact containing member from a first position to a second position such that upon connection of the electrical contact and wire said gel within the container is elastically deformed and maintained in direct engagement with said electrical contact and wire so that said electrical contact and wire connection is environmentally sealed;

said force member also adapted to move the container or an electrical contact containing member from said second position to said first position whereby said electrical contact and wire may be disconnected; and

wherein said gel has a cohesive strength greater than its adhesive strength whereby upon disconnection of the electrical contact and wire, said gel remains substantially within said container.

9. The device according to claim 8 wherein said gel a cone penetration of 150 to 350 (10^-1 mm).

10. The device according to claim 9 wherein said gel is initially formed in contact with said container and electrical contact.

11. The device according to claim 10 wherein said force member is selected to include a member from the group consisting of a nut, a bolt, and combinations thereof.

12. The device according to claim 11 wherein said container is composed of an organic polymeric material and said gel is an aliphatic polyurethane composition selected from the group consisting of a plasticized polyurethane, an oil-extended polyurethane.

13. The device according to claim 10 wherein said gel is a silicone gel with an elastic modulus less than 10⁵ dyne/cm².

14. The device according to claim 8 wherein said gel is selected from the group consisting of gels substantially inert towards the wire;

hydrolytically stable moisture insensitive and electrically insulating gels;

tacky gels;

non-tacky gels; and

gels with combinations of properties thereof.

15. A device for protecting an electrical contact and wire connection wherein the contact is mounted in a base and the wire is external to the base. comprising:

(1) a gel formed prior to making the connection between the electrical contact and wire. Said gel having an elastic modulus of less than 10⁶ dynes/cm ² and an ultimate elongation of at least 200%;

(2) a container for the gel; and

(3) a force member adapted to move the container relative to said base between a first unsealed position to permit connection of the electrical contact and wire and a second environmentally sealed position wherein said gel within the container is elastically deformed and maintained in direct engagement with said electrical contact and wire connection.

16. The device according to claim 15 wherein said gel having a cone penetration of 150-350 (10^-1 mm).

17. The device according to claim 16 wherein said gel is initially formed in contact with said container.

18. The device according to claim 15 said gel having a cone penetration value of 150-350 (10^-1 mm), said gel having an adhesive strength to the wire to be sealed which is less than the gel'"'"'s cohesive strength.

19. The device according to claim 15 wherein said container surrounds an electrical contact and said gel is initially formed in contact with said container and electrical contact and said gel has a cone penetration value of 150-350 (10^-1 mm).

20. The device according to claim 15 wherein with said container is associated with an insulation displacement electrical contact and said gel, said gel having an adhesive strength the wire to be sealed which is less than the gel'"'"'s cohesive strength and an elastic modulus of less than 10⁵ dynes/cm² and a cone penetration value of 150-350 (10^-1 mm), and said force member includes a bolt member.

21. A reusable apparatus for environmentally protecting a wire and electrical contact connection, said apparatus comprising:

a reusable receptacle for housing the wire and electrical contact connection;

a gel formed prior to making the wire and electrical contact connection, said gel being disposed within said receptacle and having an ultimate elongation of at least 200%, an elastic modulus of less than 10⁶ dynes/cm², and a cone penetration of 150-350 (10^-1 mm);

a repeatedly activateable force member assembled with said receptacle to cause elastic deformation of said gel at said wire and electrical contact connection when said force member is activated to environmentally seal the connection.

22. The reusable protection apparatus of claim 21 wherein said force member acts to move said receptacle from a first position to a second position.

23. The reusable protection apparatus of claim 22 wherein said receptacle is completely separable from said electrical contact.

24. The reusable protection apparatus of claim 21 wherein said force member acts to move the electrical contact from a first unsealed position to a second sealed position.

25. A reusable protection apparatus for environmentally protecting a plurality of wire and electrical contact connections said apparatus comprising:

a plurality of wire and electrical contact connections;

at least one reusable receptacle for isolating one of said electrical contact and wire connections;

a gel formed prior to making the wire and electrical contact connection, said gel being disposed within said receptacle and having a cone penetration of about 150 to about 350 (10^-1 mm) and an ultimate elongation of at least about 200% and an elastic modulus of less than 10⁶ dynes/cm² ; and

a repeatedly activateable force member assembled with said receptacle to cause compression of said gel at said wire and electrical contact connection when said force member is actuated whereby the sealing by the gel of the wire and electrical contact connection prevents shorting between adjacent electrical contact wire connections.