B - Operations – Transporting – 21 – F
Patent
B - Operations, Transporting
21
F
140/6
B21F 3/00 (2006.01) H05B 3/68 (2006.01) H05B 3/74 (2006.01)
Patent
CA 1137860
SHAPING OF COILS ABSTRACT OF THE DISCLOSURE The invention relates to the shaping of coils in the form of helically wound bare wires, particularly for use in "smooth top" cookers. In so-called "smooth top" cookers an unprotected helically coiled wire is secured in a electrically and thermally insulative base to tran- smit heat primarily by radiation through a smooth top, normally of glass ceramic. The coils used in such cookers are normally very springy and require careful securement if they are not to free themselves during the life of the cooker. According to the present invention, the stresses which cause this springy resilience can be relieved by holding a coil in a groove of the desired configuration and heating it, normally to the annealing temperature of the material of the coil. The subsequently cooled coil will then hold its shape and not tend to straighten, and can be more easily held in place in the cooker.
345160
Kirby Eades Gale Baker
Micropore International Limited
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