Varying diameter canted coil spring contacts and related methods of forming

• US 8,735,751 B2
• Filed: 04/23/2012
• Issued: 05/27/2014
• Est. Priority Date: 04/26/2011
• Status: Active Grant

• Current Assignee: Bal Seal Engineering Incorporated (Kaman Corporation)
• Original Assignee: Bal Seal Engineering Incorporated (Kaman Corporation)
• Inventors: Rust, Steve
• Primary Examiner(s): GIRARDI, VANESSA MARY
• Application Number:
  US13/453,337
• Publication Number:
  US 20120273332A1
• Time in Patent Office: 764 Days
• Field of Search: 200/275, 439/840, 439/841, 324/754.14
• US Class Current: 200/276
• CPC Class Codes: H01R 13/111 co-operating with pins having a circular transverse section
• CPC Class Codes: H01R 13/187 with spring member in the socket
• CPC Class Codes: Y10T 29/49105 Switch making

Abstract

A contact assembly is disclosed herein with a spring contact located in a housing wherein a plurality of coils of the spring contact are interconnected with one another and all slanted or canted. The coils further have outside diameters of different outside dimensions, such as one section of the spring contact having a larger outside diameter than the other section or sections of the spring contact. When inside the interior cavity of the housing, the first end and the second end are spaced from one another and wherein some of the plurality of coils do not contact the housing. A pin, rod, or shaft is locatable in a passage of the spring contact of the contact assembly but less than all of the coils of the spring contact grip against the exterior surface of the pin, rod or shaft.

Claims

1. A contact assembly comprising:

a spring contact comprising a plurality of coils interconnected with one another such that each portion of the plurality of coils are canted toward a common direction and at least some of the coils have outside diameters of different outside dimensions;

the spring contact comprising a first end, a second end, a center section and an open passage through the plurality of canted coils;

a housing comprising an interior cavity;

wherein the spring contact is located, at least in part, inside the interior cavity of the housing and wherein the first end and the second end are spaced from one another and some of the plurality of coils do not contact the housing; and

wherein a pin is disposed in the open passage of the plurality of coils.

2. The contact assembly of claim 1, wherein the first end has coils with an outside diameter that differs from an outside diameter of the second end.

3. The contact assembly of claim 1, wherein the first end has a coil with a coil diameter that is the same as a coil diameter of at least one coil at the second end.

4. The contact assembly of claim 1, wherein the interior cavity of the housing comprises an inside diameter and the housing comprises at least one opening at an end of the housing through which the spring contact is inserted, the at least one opening having a smaller diameter than an outside diameter of at least two coils of the plurality of coils and smaller than the inside diameter of the interior cavity.

5. The contact assembly of claim 1, wherein the housing has a longitudinal seam along a lengthwise axis.

6. The contact assembly of claim 1, wherein the pin comprises a tapered insertion end.

7. The contact assembly of claim 1, further comprising a first source in electrical communication with a second source.

8. The contact assembly of claim 7, wherein the first source is connected to the housing by a first cable or a first wire and the second source is connected to the pin by a second cable or a second wire.

9. A method for forming a contact assembly comprising:

providing a spring contact comprising a plurality of coils interconnected with one another such that each portion of the plurality of coils are canted toward a common direction and at least some of the coils have outside diameters of different outside dimensions and having an open passage through the plurality of canted coils;

the canted coil spring contact comprising a first end, a second end, and a center section and wherein the plurality of canted coils are canted to a respective relaxed state;

providing a housing comprising an interior cavity and at least one open end; and

placing the canted coil spring contact into the interior cavity of the housing through the at least one open end such that the first end and the second end are spaced from one another and wherein some of the plurality of coils do not contact the housing;

placing a pin through the open passage of the canted coil spring contact; and

wherein insertion of the pin causes at least one of the plurality of coils to enlarge by deflecting more upwardly and less canted.

10. The method of claim 9, further comprising slanting or canting the plurality of coils from their respective relaxed state prior to placing the spring contact into the interior cavity of the housing.

11. The method of claim 9, wherein the center section of the spring contact does not contact the housing.

12. The method of claim 9, wherein the at least one open end has a smaller diameter than outside diameter of at least one of the plurality of coils.

13. The method of claim 9, wherein the pin comprises a tapered insertion end.

14. The method of claim 13, further comprising forming a plurality of grooves on an exterior of a pin and passing the pin through a passage of the spring contact.

15. The method of claim 13, further comprising placing a first source in electrical communication with a second source.

16. The method of claim 15, further comprising using a first cable or a first wire to connect the first source to the contact assembly and using a second cable or a second wire to connect the second source to the pin.

17. A contact assembly comprising a housing and a spring contact located therein in electrical contact with a pin;

wherein the spring contact comprises a plurality of coils interconnected with one another such that each portion of the plurality of coils are canted toward a common direction and provide an open passage through the plurality of canted coils which include a first diameter and a second smaller diameter;

wherein the pin causes at least one of the plurality of coils with the second smaller diameter to enlarge by deflecting more upwardly and less canted.

18. The contact assembly of claim 17, wherein the housing comprises an inlet opening comprising a width and wherein the width of the inlet opening is larger than a coil width of a largest coil.

19. The contact assembly of claim 17, wherein the coils with the first diameter contact the housing but not the coils with the second smaller diameter.

20. The contact assembly of claim 17, wherein the spring contact has a first end and a second end with the first diameter and a center section with the second smaller diameter.

21. The contact assembly of claim 17, wherein the contact assembly further comprises a cap attached to one of two ends of the housing.

22. The contact assembly of claim 17, wherein the housing is a one piece housing.