Method of making contact bodies

1. A method of connecting contact sheets to form a contact body, comprising:

(a) providing at least a first and second pair of corrugated contact sheets having crests and valleys, the crests having peak surfaces and the valleys having trough surfaces, each contact sheet having opposing surfaces and a plurality of projections extending outward from one surface and located on the peak surfaces of the crests and the trough surfaces of the valleys, the projections extending in the same direction from the one surface of each contact sheet, wherein each projection defines a depression on the opposite surface of the contact sheet, some of the plurality of projections being edge projections on each peak surface and each trough surface adjacent side edges of each sheet, and the rest of the plurality of projections being interior projections on each peak surface and each trough surface in the interior of the sheet away from the side edges;

(b) positioning the projections of one of the contact sheets within mating depressions of an adjacent contact sheet, thereby forming projection-depression couplings, the edge projections and the interior projections of the two contact sheets of each of the first and second pair forming projection-depression couplings with corresponding projections of the adjacent sheet of the pair; and

(c) mechanically deforming at least some of the projection-depression couplings comprised of the edge projections and the interior projections to form positive locks in the form of flattened interlocked rivets between at least some of the contact sheet projection-depression couplings of each pair; and

(d) mechanically deforming at least some of only the edge projections of the first pair of contact sheets that form projection-depression couplings with the edge projections of the second pair of contact sheets to form positive locks in the form of flattened interlocking rivets between the first and second pairs of contact sheets.

2. The method according to claim 1 , wherein the projections of each contact sheet are in the shape of a truncated cone.

3. The method according to claim 1 , wherein the peak surfaces and trough surfaces have portions that are substantially parallel to the plane of the contact sheet.

4. The method according to claim 1 , wherein the plurality of projections are spaced along the peak surfaces and the trough surfaces, the projections located on the peak surfaces being aligned longitudinally with the projections located on the trough surfaces.

5. The method according to claim 1 , further comprising mechanically deforming all of the projection-depression couplings of the sheets forming each of the first and second pairs to form positive locks between all of the contact sheet projections of each of the first and second pairs, and mechanically deforming all of the edge projections of the first pair of contact sheets that form projection-depression couplings with the edge projections of the second pair of contact sheets to form positive locks between the first and second pairs of contact sheets.

6. The method according to claim 1 , wherein the contact body further comprises a plurality of pairs of contact sheets.

7. The method according to claim 6 , further comprising mechanically deforming all of the projection-depression couplings of each pair of the contact sheets to form positive locks between all of the contact sheet projections of each pair, and the method further comprising mechanically deforming all of the edge projections of each pair of contact sheets that form projection-depression couplings with the edge projections of an adjacent pair of contact sheets to form positive locks between each adjacent pair of contact sheets.