Extension cable with several groups of wires of different lengths connected to a plug having an anti-rotation ring and a compression clamp

• US 8,172,600 B2
• Filed: 04/06/2011
• Issued: 05/08/2012
• Est. Priority Date: 04/06/2010
• Status: Active Grant

• Current Assignee: Scully Signal Company
• Original Assignee: Scully Signal Company
• Inventors: Trottier, Robert R., Maguire, Daniel
• Primary Examiner(s): Prasad, Chandrika
• Application Number:
  US13/081,262
• Publication Number:
  US 20110244704A1
• Time in Patent Office: 398 Days
• Field of Search: 439/345, 439/392, 439/449, 439/567
• US Class Current: 439/392
• CPC Class Codes: H01R 13/633 for disengagement only in combination with safety switch H01R13/7132

Abstract

A breakaway cable is provided with a plug that has a number of wires that are arranged so as to disconnect in a predetermined sequence. The disconnect plug is designed to fit into a standard plug assembly. This end of the plug presents the same set of pins as a truck, thus extending the existing cable by the extender length. The breakaway cable is configured to break in a controlled manner in the event a vehicle to which the cable is connected should pull away.

Claims

1. An extension cable comprising:

a cable having a cable jacket and a plurality of wires extending from a free end of the cable jacket;

a first group of wires of the plurality of wires extending a first distance L1 from the cable jacket free end;

a second group of wires of the plurality of wires extending a second distance L2 from the cable jacket free end; and

a third group of wires of the plurality of wires extending a third distance L3 from the cable jacket free end,

a plug assembly having an inner puck portion, the plug assembly disposed around the cable;

an anti-rotation ring within the plug assembly and disposed around the cable, the anti-rotation ring comprising ears to mate with a matching pocket in the plug assembly; and

a compression clamp disposed about the cable at a location adjacent the plug assembly,

wherein a free end of each wire in each of the first, second and third groups of wires is terminated in a connector coupled to the inner puck portion, and

wherein L1<

L2<

L3.

2. The extension cable of claim 1, wherein each connector is attached to a respective wire in a same manner.

3. The extension cable of claim 2, wherein a same predetermined amount of force is necessary to remove the wire from its respective connector.

4. The extension cable of claim 3, wherein each connector is crimped onto its respective wire.

5. The extension cable of claim 1, wherein each connector is coupled to the inner puck portion by a screw.

6. The extension cable of claim 5, wherein each screw is tightened with a same predetermined amount of force.

7. The extension cable of claim 1, wherein the connector is disposed in a cylindrical housing, the housing further comprising:

a circumferential groove running about an outer surface of the cylindrical housing; and

a retaining ring disposed in the circumferential groove.

8. The extension cable of claim 7, wherein the retaining ring is sized to extend from the groove to be above the outer surface of the cylindrical housing.

9. The extension cable of claim 8, wherein the retaining ring is one of:

a single loop;

a spiral; and

a U-shaped clip.

10. A breakaway extension cable assembly comprising:

a multi-wire cable comprising an outer sheath and a plurality of wires disposed within and extending from a distal end of the outer sheath;

a connector puck comprising a plurality of connector locations;

a first plurality of the wires extending a first predetermined distance L1 from the distal end of the outer sheath, each wire connected to a respective connector location on the puck;

a second plurality of the wires extending a second predetermined distance L2 from the distal end of the outer sheath, each wire connected to a respective connector location on the puck;

an anti-rotation ring disposed about the multi-wire cable a predetermined distance back from the distal end of the outer sheath;

a cylindrical plug housing disposed about the distal end of the outer sheath; and

a compression clamp disposed about the cable adjacent a proximal end of the plug housing,

wherein the puck is disposed in the plug housing, and

wherein the anti-rotation ring is disposed within an orientation pocket located in the plug housing.

11. The breakaway extension cable assembly of claim 10, wherein L2>

L1.

12. The breakaway extension cable assembly of claim 10, wherein:

a free end of each wire is terminated in a connector.

13. The breakaway extension cable assembly of claim 12, wherein each connector is attached to a respective wire in a same manner.

14. The breakaway extension cable assembly of claim 13, wherein a same predetermined amount of force is necessary to remove the wire from its respective connector.

15. The breakaway extension cable assembly of claim 14, wherein each connector is crimped onto its respective wire.

16. The breakaway extension cable assembly of claim 12, wherein each connector is coupled to the puck by a screw.

17. The breakaway extension cable assembly of claim 16, wherein each screw is tightened with a same predetermined amount of force.

18. The breakaway extension cable assembly of claim 10, further comprising:

a circumferential groove running about an outer surface of the cylindrical plug housing; and

a retaining ring disposed in the circumferential groove.

19. The breakaway extension cable assembly of claim 18, wherein the retaining ring is sized to extend from the groove to be above the outer surface of the cylindrical plug housing.

20. The breakaway extension cable assembly of claim 19, wherein the retaining ring is one of:

a single loop;

a spiral; and

a U-shaped clip.

21. The breakaway extension cable assembly of claim 11, further comprising:

a third plurality of the wires extending a third predetermined distance L3 from the distal end of the outer sheath, each wire connected to a respective connector location on the puck, wherein L3>

L2>

L1.