Electrical connector and method of splicing wires

• US 4,864,725 A
• Filed: 04/18/1988
• Issued: 09/12/1989
• Est. Priority Date: 10/12/1982
• Status: Expired due to Term

• 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): Goldberg, Howard N.
• Assistant Examiner(s): Arbeg, Carl J.
• Application Number:
  US07/183,546
• Time in Patent Office: 512 Days
• Field of Search: 29/858, 29/868, 29/871, 29/872, 174/76, 174/84 C, 174/84 R, 174/85, 174/88 C, 174/92, 174/93, 524/157, 524/267, 524/491, 524/848, 264/272.11, 428/904
• US Class Current: 29/871
• 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
• CPC Class Codes: Y10S 428/904 Artificial leather
• CPC Class Codes: Y10T 29/49199 including deforming of joining bridge

Abstract

An article and process for splicing electrical wires that are to be exposed to an adverse environment. The article includes a connector, an insulating sleeve adapted to retain the connector, and an encapsulant. The encapsulant, which is disposed within the insulating sleeve, has a cone penetration value of 100 to 350 (10^-1 mm) and an ultimate elongation of at least 200%.

Claims

1. An article for splicing electrical wires, comprising:

(a) an electrical connector which is adapted to receive electrical wires and to be mechanically deformed to electrically connect the electrical wires received therein;

(b) an insulating sleeve adapted to surround and retain said connector; and

(c) an encapsulant disposed and positioned within said electrical connector, so that electrical wires received therein penetrate the encapsulant said encapsulant having been gelled to form a solid having a cone penetration value of 100 to 350 (10^-1 mm) and an ultimate elongation of at least 200%.

2. An article as recited in claim 1, wherein the electrical connector is surrounded and retained by the sleeve, and is adapted to be mechanically crimped through said sleeve.

3. An article as recited in claim 1 wherein the encapsulant is an oil-extended polyurethane.

4. An article as recited in claim 3, wherein the encapsulant has been prepared by gelling a liquid mixture comprising 20 to 40% of curable polyurethane precursor materials and 80 to 60% of a mixture of mineral oil and vegetable oil in which the ratio by weight of mineral oil to vegetable oil is 0.7 to 2.4;

the percentages being by weight based on the total weight of the polyurethane precursor materials and the mixture of mineral and vegetable oils.

5. An article as recited in claim 1, wherein the encapsulant is a plasticized polyurethane.

6. An article as recited in claim 1, wherein said cone penetration value is 100 to 200 (10^-1 mm).

7. An article as recited in claim 1, wherein said encapsulant has an ultimate elongation of at least 500%.

8. An article as recited in claim 1 wherein the connector is adapted to receive insulated electrical wires and comprises an insulation-displacing member which, when the connector is crimped around insulated electrical wires placed within the connector, displaces insulation on the electrical wires and effects electrical connection between the wires.

9. An article as recited in claim 1 wherein the connector is adapted to receive electrical wires having end sections which are free of insulation and which, when the connector is crimped around such wires placed within the connector, mechanically deforms the wires so that they are in physical and electrical contact with the connector.

10. An article as recited in claim 1 wherein said sleeve is provided with flexible end-guards to protect said encapsulant.

11. The article as recited in claim 1, wherein the cone penetration value is 100 to 250 (10^-1 mm).

12. A process for splicing electrical wires, comprising the steps of:

(a) inserting end sections of at least two electrical wires in an article that comprises;

(i) an electrical connector adapted to receive electrical wires and to be mechanically deformed to electrically connect the electrical wires received therein;

(ii) a deformable insulating sleeve that surrounds and retains said electrical connector; and

(iii) an encapsulant disposed and positioned within said electrical connector so that electrical wires received therein penetrate the encapsulant, said encapsulant having been gelled to form a solid having a cone penetration value of 100 to 350 (10^-1 mm) and an ultimate elongation of at least 200%; and

(b) exerting pressure on said electrical connector through said insulating sleeve, thereby permanently deforming the connector to displace the encapsulant from between the wires and the connector to thereby electrically connect said electrical wires and encapsulate the electrical connection within the encapsulant.

13. A process as recited in claim 12, wherein the encapsulant is an oil-extended polyurethane.

14. A process as recited in claim 12, wherein the encapsulant has been prepared by gelling a liquid mixture comprising 20 to 40% of curable polyurethane precursor materials and 80 to 60% of a mixture of mineral oil and vegetable oil in which the ratio by weight of mineral oil to vegetable oil is 0.7 to 2.4;

the percentages being by weight based on the total weight of the polyurethane precursor materials and the mixture of mineral and vegetable oils.

15. A process as recited in claim 12, wherein the encapsulant is a plasticized polyurethane.

16. A process as recited in claim 12, wherein said cone penetration value is 100 to 200 (10^-1 mm).

17. A process as recited in claim 12, wherein said cone penetration value is 200 to 300 (10^-1 mm).

18. A process as recited in claim 12, wherein said encapsulant has an ultimate elongation of at least 500%.

19. A process as recited in claim 12, wherein said encapsulant has an ultimate elongation of at least 750%.

20. A process as recited in claim 12 wherein said end sections are insulated and the connector comprises an insulation displacing member which, when the connector is crimped, displaces insulation on the end sections and effects electrical connection between the wires.

21. A process as recited in claim 12 wherein said end sections are free of insulation and the connector, when it is crimped, mechanically deforms the end sections so that they are in physical and electrical contact.