Louis G Trnovec

US Patent:

59217030, Jul 13, 1999

Filed:

Jun 25, 1997

Appl. No.:

8/882515

Inventors:

Jonathan B. Becker - Arcadia CA
Martin L. Dala - Sunset Beach CA
Bryan R. Nix - Diamond Bar CA
Louis G. Trnovec - Monrovia CA

International Classification:

E01F 1302

US Classification:

404 6

Abstract:

A rigid caltrop structure is formed of two metallic members abutting each other and welded together, each of the members including all of a single triangular planar portion and parts of two other adjoining triangular planar portions, the pairs of adjacent corners of sides of the triangular portions forming penetration points so that when three of the penetration points rest on a horizontal surface and the fourth penetration point projects upward, a force applied to that fourth penetration point will not directly tend to shear the weld.