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| Number | Title | Issue Date |
| 6648996 | Method and apparatus for producing a helical spring The present invention is directed to a method for producing a helical spring which comprises the steps of providing a plurality of parameters for defining a desired configuration of a target helical spring, setting at least bending positions and twisting ... | 11/18/2003 |
| 6132533 | Method for making arcuate coil springs, resulting springs and devices for carrying out the method The invention relates to a method for making arcuate coil springs from straight coil springs and particularly includes a phase of bending the straight springs during a heat treatment, which method provides exceptional results in that for the bending, a la... | 10/17/2000 |
| 5868996 | Device for manufacturing curved helical springs The objects are a reliable and economical method of and device for manufacturing helical springs that are curved when unstressed from sections of wire or rod heated to coiling temperature. The spring is coiled straight and then curved it to its final shap... | 02/09/1999 |
| 5447293 | Method and apparatus for quenching heat treated objects A quench chute for use in heat treating objects extends from one end of a furnace into a tank filled with quenching fluid. The chute has a passage therein through which heat treated objects fall from the furnace into the tank. Laminar sheets of quenching ... | 09/05/1995 |
| 5004213 | Leaf-spring hardener An apparatus for bending leaf-spring blanks is combined with a vessel containing a bath of a hot treatment liquid and defining a longitudinal treatment path below a surface of the liquid, a center guide extending longitudinally along the path in the bath,... | 04/02/1991 |
