ELECTRICAL CONTACT ASSEMBLIES WITH CANTED COIL SPRINGS

• US 20100279558A1
• Filed: 01/21/2010
• Published: 11/04/2010
• Est. Priority Date: 04/29/2009
• Status: Abandoned Application

• Current Assignee: Bal Seal Engineering Incorporated (Kaman Corporation)
• Original Assignee: Bal Seal Engineering Incorporated (Kaman Corporation)
• Inventors: Leon, Gordon, Vu, Kevin
• Application Number:
  US12/691,564
• Publication Number:
  US 20100279558A1
• Time in Patent Office: Days
• US Class Current: 439/817
• CPC Class Codes: H01R 13/03 characterised by the material, e.g. plating, or coating materials
• CPC Class Codes: H01R 13/17 with spring member on the pin
• CPC Class Codes: H01R 13/187 with spring member in the socket
• CPC Class Codes: H01R 13/2421 using coil springs
• CPC Class Codes: H01R 13/426 Securing by a separate resilient retaining piece supported by base or case, e.g. collar or metal contact-retention clip
• CPC Class Codes: H01R 13/6277 comprising annular latching means, e.g. ring snapping in an annular groove
• CPC Class Codes: H01R 2107/00 Four or more poles
• CPC Class Codes: H01R 24/58 Contacts spaced along longitudinal axis of engagement
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

An electrical contact assembly including a housing defining a bore having an internal groove formed therein; an axial canted coil spring having a plurality of spring coils, each spring coil having a spring coil length, the plurality of spring coils disposed in the internal groove with a groove width having a width dimension; wherein at least one spring coil comprises a minor axis length that is greater than the width dimension. An insertion object sized for insertion into the bore of the housing; wherein a clamping force of the axial canted coil spring retains the insertion object within the bore; and wherein the axial canted coil spring provides an electrical conductive path between the insertion object and the housing that is less than 50% of the spring coil length

Claims

1. An electrical contact assembly comprising:

a housing defining a bore having an internal groove formed therein;

an axial canted coil spring comprising a plurality of spring coils, each spring coil having a spring coil length, the plurality of spring coils disposed in said internal groove comprising a groove width with a width dimension;

wherein at least one spring coil comprises a minor axis length that is greater than the groove width dimension; and

an insertion object sized for insertion into the bore of the housing;

wherein a clamping force of said axial canted coil spring retains the insertion object within the bore; and

wherein the axial canted coil spring provides an electrical conductive path between the insertion object and the housing that is less than 50% of the spring coil length.

2. The electrical contact assembly of claim 1, wherein the axial canted coil spring comprises an axial garter type canted coil spring.

3. The electrical contact assembly of claim 1, wherein said internal groove comprises a first side wall, a second side wall, and an extended flat-bottom wall, and wherein the axial canted coil spring is retained in said internal groove by contacting the first side wall at a first contact point and the second side wall at a second contact point and spaced from the flat-bottom wall.

4. The electrical contact assembly of claim 1, wherein said internal groove comprises a first side wall, a second side wall, and an extended flat-bottom wall, and wherein the axial canted coil spring contacts the first side wall at a first contact point and contacts the insertion object at a second contact point to create the electrical conductive path.

5. The electrical contact assembly of claim 1, wherein the axial canted coil spring provides an electrical conductive path between the insertion object and the housing that is less than 30% of the spring coil length.

6. The electrical contact assembly of claim 1, wherein said internal groove comprises a first side wall, a second side wall, and a tapered-bottom wall, and wherein the axial canted coil spring is retained in said internal groove by contacting the first side wall at a first contact point, the second side wall at a second contact point, the tapered-bottom wall at a third contact point, and the insertion object at fourth contact point.

7. The electrical contact assembly of claim 6, wherein the electrical conductive path comprises the electrical conductive path between the first contact point and the fourth contact point or the second contact point and the fourth contact point.

8. The electrical contact assembly of claim 1, wherein an insertion end of the insertion object comprises a spherical shape.

9. The electrical contact assembly of claim 1, wherein the axial canted coil spring comprises a multi-metallic spring wire comprising two or more material layers.

10. The electrical contact assembly of claim 1, wherein the axial canted coil spring is mounted within the internal groove in various shape configurations taken from the group consisting of round, square, oval, rectangular, and any polygonal shape configurations.

11. An electrical contact assembly comprising:

a housing defining a bore comprising an internal groove having a first side wall, a second side wall and a bottom wall located therebetween;

at least one of an axial canted coil spring and a radial canted coil spring disposed in said internal groove, the canted coil spring having a spring coil having a spring coil length that contacts at least one of said side walls at a first contact point; and

an insertion object sized for insertion into the bore;

wherein the canted coil spring contacts the insertion object at an insertion object contact point to retain the insertion object within the bore, and

wherein an electrical path length between the first contact point and the insertion object contact point is less than 30% of the spring coil length.

12. The electrical contact assembly of claim 11, wherein the bottom wall comprises a tapered-bottom wall, which is non-orthogonal to the first side wall or the second side wall.

13. The electrical contact assembly of claim 11, wherein the canted coil spring comprises a coil width that is greater than the coil height.

14. The electrical contact assembly of claim 11, wherein the spring coil is selected from a group consisting of round, square, oval, and rectangular shaped spring coil.

15. The electrical contact assembly of claim 11, wherein said canted coil spring is positioned at a concave turn angle orientation relative to the insert direction of the insertion object prior to contacting the insertion object.

16. The electrical contact assembly of claim 11, wherein the spring coil is shaped to provide an increased contact area between the canted coil spring and both the housing and the insertion object.

17. The electrical contact assembly of claim 16, wherein said spring coil is selected from a group consisting of round, square, oval, rectangular, and any polygonal shaped spring coil.

18. The electrical contact assembly of claim 11, wherein said canted coil spring comprises a spring length comprising two un-connected ends.

19. The electrical contact assembly of claim 11, wherein said insertion object comprises an external groove and wherein at least one side of said external groove is orthogonal to an axis of said insertion object to lock said insertion object within the bore.

20. The electrical contact assembly of claim 11, wherein said insertion object is latched in said bore.

21. The electrical contact assembly of claim 11 wherein said insertion object comprises an insertion end having a shape of a spherical object.

22. The electrical contact assembly of claim 11, wherein said canted coil spring comprises a multi-metallic spring wire comprising two or more material layers.

23. A method of connecting an electrical contact assembly comprising:

providing a housing comprising a groove having a first side wall, a second side wall, and a bottom wall;

positioning a canted coil spring in said internal groove;

inserting an insertion object into the housing to create an electrical path length extending from a first contact point between at least one of the side walls and the canted coil spring and a second contact point between the insertion object and the canted coil spring, the electrical path length between the first contact point and the second contact point being less than half of a length of a spring coil of the canted coil spring.

24. The method of claim 23, wherein the bottom wall comprises a tapered-bottom wall.

25. The method of claim 23, wherein the canted coil spring comprises an axial or radial canted coil spring.

26. The method of claim 23, further comprising rotating the canted coil spring to an angle relative to the bottom wall upon contact between the canted coil spring and an outside diameter of the insertion object.

27. The method of claim 23, wherein said canted coil spring is positioned at a concave turn angle orientation relative to the insert direction of the insertion object.

28. The method of claim 23, wherein said inserting the insertion object into the bore comprises capturing said canted coil spring in an external groove formed on the insertion object to removably latch said insertion object within said bore.

29. The method of claim 23, wherein the housing comprises a channel comprising two spaced sidewalls.

30. The method of claim 29, wherein the groove is located in at least one of the sidewalls.