Electrical switching apparatus and strain relief assembly therefor

Patent metadata

Field	Value
Publication number	US-9842715-B2
Application number	US-201514959161-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Dec 4, 2015
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

Electrical switching apparatus and strain relief assemblies therefor are described herein. In one exemplary, non-limiting embodiment, a strain relief assembly includes a cover and a base, each of which include a number of grooves structured to receive a number of wires. Each groove has a first side and a second side, where the second side is located opposite the first side. Furthermore, located on the first side and/or the second side are a number of protrusions. The grooves and the protrusions serve to secure the number of wires within the strain relief assembly such that, if a force is applied to an end of the wire, the protrusions work to retain the wires with the assembly.

First claim

What is claimed is:

1. A strain relief assembly for an electrical switching apparatus, comprising:
a cover comprising:
at least one first groove structured to receive at least one wire, the at least one first groove having a first side and a second side located opposite the first side; and
at least one first protrusion located on at least one of the first side and the second side, each at least one first protrusion extending outwardly from the corresponding one of the first side and the second side toward the other of the first side and the second side to apply a force against the at least one wire, thereby pinching and securing the at least one wire in at least one first location within the at least one first groove; and

a base comprising:
at least one second groove structured to receive the at least one wire, respectively, from the at least one first groove, the at least one second groove having a third side and a fourth side located opposite the third side; and
at least one second protrusion located on at least one of the third side and the fourth side, each at least one second protrusion extending outwardly from the corresponding one of the third side and the fourth side toward the other of the third side and the fourth side to apply a force against the at least one wire, thereby pinching and securing the at least one wire in at least one second location within the at least one second groove.

2. The strain relief assembly of claim 1 , wherein the at least one first groove and the at least one second groove are misaligned such that the at least one wire is directed in a first direction when received by the at least one first groove, and then is redirected in a second direction when received by the at least one second groove, thereby creating a plurality of pinch points to retain the at least one wire while reducing strain on the at least one wire.

3. The strain relief assembly of claim 1 , wherein:
the at least one first protrusion comprises:
a first abutment located on, and protruding out from, the first side; and
a second abutment located on, and protruding out from, the second side; and

the at least one second protrusion comprises:
a third abutment located on, and protruding out from, the third side; and
a fourth abutment located on, and protruding out from, the fourth side.

4. The strain relief assembly of claim 3 , wherein:
the first abutment and the third abutment both protrude in a third direction;
the second abutment and the fourth abutment both protrude in a fourth direction; and
the third direction is opposite the fourth direction.

5. The strain relief assembly of claim 3 , wherein the first abutment, second abutment, third abutment, and fourth abutment are each substantially triangular in shape such that they impinge the at least one wire when the at least one wire is received within the at least one first groove and the at least one second groove.

6. The strain relief assembly of claim 1 , wherein:
the first side is substantially parallel to the second side;
the third side is substantially parallel the fourth side; and
a surface of the first side, second side, third side, and fourth side that contacts the at least one wire, is substantially coarse.

7. The strain relief assembly of claim 1 , wherein:
the at least one wire comprises a first wire and a second wire;
the at least one first groove comprises a first groove structured to receive the first wire and a second groove structured to receive the second wire; and
the at least one second groove comprises a third groove structured to receive the first wire and a fourth groove structured to receive the second wire.

8. The strain relief assembly of claim 1 , further comprising:
an accessory component comprising at least one third groove operable to receive the at least one wire from one of: the at least one first groove and the at least one second groove, wherein:
the at least one first groove directs the at least one wire in a first direction, the at least one second groove directs the at least one wire in a second direction, and the at least one third groove directs the at least one wire in a third direction.

9. The strain relief assembly of claim 1 , wherein the cover and the base are formed, at least in part, of a non-insulating plastic.

10. The strain relief assembly of claim 1 , wherein:
the at least one first groove of the cover is located on an extension from a top portion of the cover; and
the at least one second groove of the cover is location on an extension from a bottom portion of the base.

11. A strain relief system for an electrical switching apparatus, comprising:
a primary cover including a side wall and an extension portion that form a trough, the extension portion having a first protrusion located at an end of the extension portion;
a secondary cover placed over the primary cover, the secondary cover comprising at least a second protrusion and a third protrusion; and
a wire coupled to an accessory component located within a pocket of the primary cover, wherein the strain relief system is structured such that the wire:
extends through a channel formed between the first protrusion of the primary cover and the second protrusion and the third protrusion of the secondary cover; and
exits the electrical switching apparatus from the trough, which is connected to the channel,

wherein the first protrusion, second protrusion, and the third protrusion each are structured to impinge the wire at separate locations along a length of the wire.

12. The strain relief system of claim 11 , wherein the channel and the trough have a width of at least approximately 0.120 inches.

13. The strain relief system of claim 11 , wherein the first protrusion, second protrusion, and the third protrusion each have a surface that is substantially coarse.

14. The strain relief system of claim 11 , wherein a section of a surface of at least one of the first protrusion, second protrusion, and the third protrusion comprises an adhesive.

15. The strain relief system of claim 11 , wherein the first protrusion and the second protrusion impinge the wire in a first direction, the secondary cover further comprises:
a fourth protrusion that impinges the wire in a second direction perpendicular to the first direction.

16. The strain relief system of claim 11 , wherein the second protrusion is separated from the third protrusion by a distance equal to approximately a width of the extension portion.

17. The strain relief system of claim 11 , further comprising:
a grooved structure that is coupled to the secondary cover, wherein strain relief system is structured such that:
the wire extends through a groove of the grooved structure.

18. The strain relief system of claim 17 , wherein:
the first protrusion is structured to apply a first force to the wire in a first direction at a first location along a length of the wire;
the second protrusion is structured to apply a second force to the wire in a second direction at a second location along the length of the wire, the second direction being opposite the first direction;
the third protrusion is structured to apply a third force to the wire in the second direction at a third location along the length of the wire; and
the groove is structured to apply a fourth force to the wire in a third direction that is perpendicular to the first direction and the second direction, the fourth force being applied at a fourth location along the length of the wire.

19. The strain relief system of claim 17 , wher

Assignees

• Eaton Corp

Inventors

• Devine Jack Edward
• Turner David Curtis
• Lee Stephanie Feejin
• Rizzo Bradley Patrick
• Janusek Mark Anthony
• Malingowski Richard Paul
• Sisley James Patrick

Classifications

• H01H71/025 Primary

  Constructional details of housings or casings not concerning the mounting or assembly of the different internal parts · CPC title

• H01H71/08

  Terminals; Connections · CPC title

• H01H2071/0292

  Housing or frames containing grooves or slots for guiding movable parts · CPC title

• H02G15/007

  Devices for relieving mechanical stress · CPC title