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| Number | Title | Issue Date |
| 6684479 | Method and apparatus for clinching metal sheets A method and apparatus for clinching metal sheets is disclosed. The apparatus includes a punch assembly for stamping indentations into stacked metal sheets and a die assembly for assisting in supporting the sheets during stamping of the indentations and f... | 02/03/2004 |
| 4473738 | Method and apparatus for hot forming a polygonal head on a snap tie rod An apparatus for hot forming a polygonal head on an end of a tie rod includes a split electrode for gripping a tie rod and a reciprocating electrode for deforming the tie rod end. One of the electrodes defines a die cavity having walls forming a polygonal... | 09/25/1984 |
| 4011429 | Hot stretch-wrap forming with resistance heating Stretch-wrap forming of titanium parts or the like by resistance heating the part and a steel forming element which is cast into a fused silica die insert. Heating is accomplished by an electrical circuit in which both the part and the element are connect... | 03/08/1977 |
