Electrical contact assemblies with axially canted coil springs
View Patent ↗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.
1. A method of improving electrical transmission through an electrical contact assembly comprising an insertion object having a longitudinal axis, a housing having a bore receiving the insertion object therein, and plurality of coils of a canted coil spring in electrical communication with the housing and the insertion object, the method comprising:
reducing electrical resistance between the housing and the insertion object by providing an electrical path length between a first contact point, defined by a contact between the insertion object and a coil that contacts the insertion object, and a second contact point, defined by a contact point between the housing and the coil that contacts the insertion object,
reducing the electrical path length by about 10% to 50% compared to a direct path length of two contact points located along a line that is orthogonal to the longitudinal axis of the insertion object by:
providing a groove in the bore of the housing or on the insertion object, said groove having two generally parallel side walls and a bottom wall located between the two generally parallel side walls; and
providing an axial canted coil spring for the canted coil spring in the groove; and
biasing the axial canted coil spring against the two generally parallel side walls of the groove but spaced from the bottom wall to define two contacts for each contacting coil with the groove, the two contacts for each contacting coil with the groove increase a number of contacts for each contacting coil with the groove from a single contact with the bottom wall to two contacts with the two generally parallel side walls.
2. The method of claim 1 , wherein the electrical path length between the first contact point and the second contact point defines a shortest electrical path length between the housing and the insertion object.
3. The method of claim 1 , wherein the groove is located in the bore of the housing and the insertion object comprises a groove comprising two side walls and a bottom wall located between the two side walls.
4. The method of claim 1 , wherein the bottom wall of the groove is V-shaped.
5. The method of claim 1 , wherein the groove is located in the bore of the housing.
6. The method of claim 5 , further comprising a groove on the insertion object contacting the axial canted coil spring.
7. The method of claim 1 , wherein the electrical path length between the first contact point and the second contact point is about 30% to 50% of the direct path length.
8. The method of claim 1 , wherein the plurality of coils are selected from a group consisting of round, square, oval, and rectangular shaped spring coils.
9. The method of claim 1 , further comprising positioning the canted coil spring at a concave turn angle orientation relative to an insert direction of the insertion object prior to inserting the insertion object into the bore of the housing.
10. The method of claim 1 , wherein the spring coil is shaped to provide an increased contact area at the first contact point and the second contact point.
11. The method of claim 1 , wherein the canted coil spring comprises a spring length comprising two un-connected ends.
12. The method of claim 1 , wherein the canted coil spring comprises a multi-metallic spring wire comprising two or more material layers.
13. A method of decreasing heat buildup through an electrical contact assembly comprising an insertion object having a longitudinal axis, a housing having a bore receiving the insertion object therein, and plurality of coils of a canted coil spring electrical communication with the housing and the insertion object by contacting the housing, the method comprising:
providing a conductive axial canted coil spring for the canted coil spring comprising a major axis and a minor axis defining a coil width measured along the minor axis;
reducing electrical resistance between the housing and the insertion object through the axial canted coil spring by providing an electrical path length between a first contact point, defined by a contact between the insertion object and a coil that contacts the insertion object, and a second contact point, defined by a contact point between the housing and the coil that contacts the insertion object,
reducing the electrical path length by about 10% to 50% compared to a direct path length of two contact points located along a line that is orthogonal to the longitudinal axis of the insertion object by:
providing a groove in the bore of the housing or on the insertion object, said groove having two generally parallel side walls defining a groove width and a bottom wall located between the two generally parallel side;
biasing the axial canted coil spring against the two generally parallel side walls of the groove but spaced from the bottom wall to define two contacts for each contacting coil with the groove, the two contacts for each contacting coil with the groove increase a number of contacts for each contacting coil with the groove from a single contact with the bottom wall to two contacts with the two generally parallel side walls; and
wherein the coil width is larger than the groove width.
14. The method of claim 13 , wherein the insertion object has a V-groove.
15. The method of claim 13 , wherein the insertion object has a tapered insertion end.
16. The method of claim 13 , wherein the bottom wall of the groove is V-shaped.
17. The method of claim 13 , wherein the electrical path length between the first contact point and the second contact point is about 30% to 50% of the direct path length of a coil of the plurality of coils.
18. The method of claim 13 , wherein the plurality of coils are selected from a group consisting of round, square, oval, and rectangular shaped spring coils.
19. The method of claim 13 , wherein the canted coil spring is positioned at a concave turn angle orientation relative to an insert direction of the insertion object prior to contacting the insertion object.
20. The method of claim 13 therein the canted coil spring comprises a multi-metallic spring wire comprising two or more material layers.