Compliant electrical contact
A compliant electrical contact ( 10 ) and an assembly ( 12 ) employing a plurality of the contacts ( 10 ). The contact ( 10 ) has several embodiments, all of which include a spring ( 20 ) with convolutions ( 22 ), a contact point ( 24 ) at each end, and a shunt ( 50 ) that is generally parallel to the spring ( 20 ) and that spans the convolutions ( 22 ) longitudinally. In one embodiment, one end of a single shunt strip ( 90 ) is fixedly attached near a contact point ( 24 a ) and the other end is slidably attached near the other contact point ( 24 b ). In another embodiment, the center of a single shunt strip ( 92 ) is fixedly attached at the center of the spring ( 20 ) and the two ends are slidably attached near the contact points ( 24 ). In another embodiment, one end of one shunt strip ( 94 ) is fixedly attached near one contact point ( 24 a ), one end of another shunt strip ( 96 ) is fixedly attached near the other contact point ( 24 b ). In one configuration, the other ends ( 104 ) of the shunt strips ( 94, 96 ) are slidably attached to the center of the spring ( 20 ). In other configurations, the other ends of the shunt strips ( 94, 96 ) are slidably electrically connected to each other. In the assembly ( 12 ), the contact ( 10 ) is placed within a through aperture ( 32 ) in a dielectric panel ( 30 ) with the contact points ( 24 ) protruding through openings ( 34 ). Optionally, the aperture ( 32 ) is filled with a compliant, electrically conductive elastomer ( 36 ) after the contact ( 10 ) is installed.
1. A compliant electrical contact adapted to be compressed through a compression range, said contact comprising:
(a) a spring comprised of an electrically conductive, inherently elastic material, and having a longitudinal axis, a plurality of convolutions in two sections with a break therebetween, a first spring end, and a second spring end;
(b) a first contact point at said first spring end;
(c) a second contact point at said second spring end; and
(d) a shunt comprised of an electrically conductive material and having a center, a first end, and a second end, said shunt extending parallel to said spring longitudinal axis, said shunt center electrically attached to said spring at said break by a fixed attachment, said first shunt end attached to said spring by a first sliding attachment adjacent to said first contact point, said second shunt end attached to said spring by a second sliding attachment adjacent to said second contact point, each of said sliding attachments including at least a shorting finger with a bend for maintaining electrical contact between said spring and said shunt.
2. The compliant electrical contact of claim 1 wherein said shunt and said spring are composed of different materials.
3. The compliant electrical contact of claim 1 wherein said sliding attachment includes a pair of shorting fingers bent between approximately 90° and approximately 180° around a corresponding open slot.
4. The compliant electrical contact of claim 3 wherein said open slots are designed to preload said contact.
5. The compliant electrical contact of claim 3 wherein said open slots are designed to limit compression of said contact.
6. The compliant electrical contact of claim 3 wherein said shorting fingers extend from said shunt around said open slots on the sides of said spring.
7. The compliant electrical contact of claim 3 wherein said shorting fingers extend from said spring around said open slots on the sides of said shunt.
8. The compliant electrical contact of claim 1 wherein said sliding attachment includes at least one shorting finger extending through a corresponding slot.
9. The compliant electrical contact of claim 8 wherein said slot is designed to preload said contact.
10. The compliant electrical contact of claim 8 wherein said slot is designed to limit compression of said contact.
11. The compliant electrical contact of claim 8 wherein said at least one shorting finger extends from said shunt through said slot in said spring.
12. The compliant electrical contact of claim 8 wherein said at least one shorting finger extends from said spring through said slot in said shunt.
13. The compliant electrical contact of claim 1 wherein said fixed attachment includes a pair of attachment fingers bent between approximately 90° and approximately 180° around a corresponding open slot.
14. The compliant electrical contact of claim 13 wherein said attachment fingers extend from said shunt around said open slots on the sides of said spring.
15. The compliant electrical contact of claim 13 wherein said attachment fingers extend from said spring around said open slots on the sides of said shunt.
16. The compliant electrical contact of claim 1 wherein said fixed attachment includes at least one attachment finger extending through a corresponding slot.
17. The compliant electrical contact of claim 16 wherein said attachment finger extends from said shunt through said slot in said spring.
18. The compliant electrical contact of claim 16 wherein said attachment finger extends from said spring through said slot in said shunt.
19. The compliant electrical contact of claim 1 wherein the side edges of said shunt are bent longitudinally to form a channel for said spring.
20. The compliant electrical contact of claim 1 wherein said contact is generally flat.