Hinged connector for heating cables of various sizes

• US 5,756,972 A
• Filed: 10/25/1994
• Issued: 05/26/1998
• Est. Priority Date: 10/25/1994
• Status: Expired due to Term

• Current Assignee: Tyco Electronics Corporation (TE Connectivity Ltd. (United Kingdom))
• Original Assignee: Raychem Limited (TE Connectivity Limited)
• Inventors: Dong, Wesley, Huang, Richard S., Landers, Carl F., Vranicar, Anthony, Wasilewski, Frank, Edwards, Larry M.
• Primary Examiner(s): PICARD, LEO P
• Assistant Examiner(s): Valencia, Raphael
• Application Number:
  US08/328,644
• Time in Patent Office: 1,309 Days
• Field of Search: 219/541, 439/98, 439/110, 439/119, 439/210, 439/274-275, 439/271, 439/459, 439/456-457, 439/910, 174/652, 174/656, 174/65 SS, 174/135, 174/59, 285/382.7
• US Class Current: 219/541
• CPC Class Codes: H01R 13/5205 Sealing means between cable and housing, e.g. grommet H01R13/5221 takes precedence
• CPC Class Codes: H01R 4/646 for cables or flexible cylindrical bodies
• CPC Class Codes: H02G 15/013 Sealing means for cable inlets inlets for cables filled with, or surrounded by, gas or oil H02G15/32
• CPC Class Codes: H02G 15/105 connected to the cable shield only H02G15/107 takes precedence

Abstract

A connector for connecting an end of a first elongate electrical heating cable to an end of a first elongate electrical component such as another heating cable or a power cable. The connector includes first and second shell members which can be in a mated or demated configuration and which, when mated, form a shell having a first inlet port for the first heating cable and a second inlet port for the first electrical component. In addition, the connector includes an element for connecting electrodes of the first heating cable to elongate members of the first electrical component and a sealing assembly for holding the first heating cable in position in the first inlet port. The sealing assembly includes a hollow cylindrical ring from which gripping elements in the form of fingers extend perpendicular to the plane of the ring, a nut for making connection to the first inlet port, and a grommet which is held by the fingers and which grips the first heating cable. Also described is a connector which comprises a mirror which is inserted in a connection module containing an element for connection, the mirror being positioned so that the element for connection can be observed from outside the module. The mirror can be used as a visual indicator allowing the installer to determine when the elongate electrical component or heating cable is correctly positioned for connection.

Claims

1. A connector for connecting an end of a first elongate electrical heating cable to an end of a first elongate electrical component, said first heating cable comprising (a) first and second elongate electrodes, (b) a plurality of resistive heating elements connected in parallel between said electrodes, and (c) an insulating jacket surrounding said electrodes and heating elements, and said first electrical component comprising a first elongate member for connection to the first electrode and a second elongate member for connection to the second electrode, said connector comprising

(1) first and second shell members which can be in one of

(a) a demated configuration, and

(b) a mated configuration in which the shell members are in contact with each other and form a shell having (i) a first inlet port for the first heating cable, the first inlet port being a hollow cylinder having an entry at one end and an outer surface at least a part of which comprises screw threads, and (ii) a second inlet port for the first electrical component;

(2) securing means for releasably maintaining the shell members in the mated configuration;

(3) a first connection means for connecting the first electrode to the first elongate member of said first electrical component within the shell;

(4) a second connection means for connecting the second electrode to the second elongate member of said first electrical component within the shell; and

(5) a sealing assembly suitable for sealing the first heating cable at the entry of the first inlet port, said assembly comprising

(a) a hollow cylindrical ring (i) suitable for mating to the first inlet port and (ii) from which fingers extend perpendicular to the plane of the ring,

(b) a nut which can be screwed onto the threads of the first inlet port, and

(c) a grommet which is held by the fingers and which seals around the first heating cable after installation,

said first and second connection means being positioned within a first connection module which fits within the shell when the first and second shell members are in the mated configuration.

2. A connector according to claim 1 which further comprises

(6) a third connection means for making an electrical connection within the shell between a first grounding element and a third elongate member of said first electrical component.

3. A connector according to claim 2 wherein the first heating cable further comprises a metallic grounding braid surrounding said insulating jacket.

4. A connector according to claim 3 wherein the first inlet port comprises a means for braid capture which comprises (a) a metal receptacle, (b) a spring which is attached to the metal receptacle and contacts and makes a connection to the grounding braid, and (c) a metal ground pin which provides electrical connection between the metal receptacle and the grounding element.

5. A connector according to claim 4 which further comprises a clip which makes physical contact to the braid and ensures contact of the braid with the spring.

6. A connector according to claim 3 wherein the first elongate electrical component is a second elongate electrical heating cable comprising (a) first and second elongate electrodes, (b) a plurality of resistive heating elements connected in parallel between said electrodes, (c) an insulating jacket surrounding said electrodes and heating elements, and (d) a metallic grounding braid surrounding said insulating jacket.

7. A connector according to claim 3 for connecting the electrical heating cable to second and third electrical heating cables, each of which comprises (a) first and second elongate electrodes, (b) a plurality of resistive heating elements connected in parallel between said electrodes, (c) an insulating jacket surrounding said electrodes and heating elements, and (d) a metallic grounding braid surrounding said insulating jacket, the connector having a first inlet port at a first end of the shell and a second inlet port at a second opposite end of the shell, which connector further comprises

(7) a third inlet port for the second heating cable, said third port located at the first end of shell;

(8) a fourth inlet port for the third heating cable, said fourth port located at the second opposite end of the shell;

(9) a fourth connection means for connecting within the shell the first electrode of the second heating cable to (i) the first electrode of the third heating cable, (ii) the first electrode of the first heating cable, and (iii) the first elongate member of the the first electrical component;

(10) a fifth connection means for connecting within the shell the second electrode of the second heating cable to (i) the second electrode of the third heating cable, and (ii) the second electrode of the second heating cable, and (iii) the second elongate member of the first electrical component; and

(11) a sixth connection means for making an electrical connection between a second grounding element and (i) the grounding braid of the second heating cable, (ii) the grounding braid of the third heating cable, and (iii) the third connection means;

said fourth and fifth connection means being positioned within a second connection module which fits within the shell adjacent to the first connection module when the first and second shell members are in the mated configuration.

8. A connector according to claim 1 wherein the first and second connection means comprise insulation displacement connectors.

9. A connector according to claim 8 wherein each of the insulation displacement connectors comprises a first piercing unit and a second piercing unit, the first and second piercing units being operably connected by a screw.

10. A connector according to claim 1 wherein the connection module comprises means for strain relief.

11. A connector according to claim 10 wherein the strain relief means comprises at least two teeth suitable for gripping the insulating jacket of the first heating cable.

12. A connector according to claim 1 wherein the first connection module is transparent.

13. A connector according to claim 1 wherein the elongate electrical component is a grounded power cable.

14. A connector according to claim 1 which further comprises a visual indicator for monitoring the first connection means.

15. A sealing assembly which comprises

(1) a first component which (a) is a hollow cylinder having an outer surface at least a part of which comprises screw threads, and (b) is composed of a first material;

(2) a second component which (a) is a hollow cylindrical ring from which fingers extend perpendicular to the plane of the ring, said fingers being composed of a second material which (i) is a polymeric composition and (ii) has a flexural modulus of at most 500,000 psi and an ultimate elongation of at least 100%, and (b) is suitable for mating to the first component; and

(3) a third component which (a) is a nut, and (b) can be screwed onto the threads of the first component.

16. An assembly according to claim 15 which further comprises

(4) a grommet which can be held in position by the fingers of the second component.

17. A connector for making an electrical connection to an elongate electrical component, said connector comprising

(1) a connection module;

(2) a connection means for connecting to a first electrode of the elongate electrical component, said connection means being inserted in the module; and

(3) a mirror which (a) is inserted in the module, and (b) is positioned so that the connection means can be observed from outside the module.

18. A connector according to claim 17 wherein the connection means comprises an insulation displacement connector.

19. A connector according to claim 17 wherein the mirror comprises aluminized polyester.

20. A connector according to claim 17 wherein at least part of the connection module is transparent.