Patent Number: 046648682
Section: claims

1. A toroidal coil apparatus, comprising: a plurality of coil support frames, each surrounding a common closed loop axis, said plurality of coil support frames having  reinforcing members provided on each of said bridge portions immediately adjacent said opposite ends of said straight inner portions, said reinforcing members having keyways and spaces formed therein, the keyways in the reinforcing members on the bridge portions of adjacent coil support frames opposing each other, the spaces in the reinforcing members on the bridge portions of adjacent coil support frames opposing each other;  keys inserted in the opposing keyways coupling adjacent coil support frames together;  bolts screwed into the reinforcing members of said adjacent coil support frames and having opposite ends extending into the opposing spaces, rigidly securing adjacent coil support frames together. 2. A toroidal coil apparatus as in claim 1, wherein said reinforcing members are formed on opposing side surfaces of the bridge portions of said coil support frames. 3. A toroidal coil apparatus as in claim 1, wherein said coil support frames have inner surfaces facing said closed loop axis and outer surfaces opposite said inner surfaces, said reinforcing members being formed on either said inner surfaces or said outer surfaces of the coil support frames. 4. A toroidal coil apparatus as in claim 1, wherein opposing keyways have dissimilar widths measured in a radial direction with respect to said center axis, and said keys have stepped shapes corresponding the said widths of said keyways. 5. A toroidal coil apparatus as in claim 1, wherein the reinforcing members of adjacent coil support frames have opposing contacting surfaces, said keyways being formed in said opposing contacting surfaces, the keys in said keyways preventing relative sliding of said coil support frames along said opposing contacting surfaces, said opposing contacting surfaces being formed on wall portions of said reinforcing members separating the opposing spaces, said bolts extending through said wall portions into said spaces. 6. A toroidal coil apparatus as in claim 5, wherein said reinforcing members are wedge-shaped and the opposing contacting surfaces of said reinforcing member are continuous with opposing contacting surface of said wedge-shaped coupling portions. 7. A toroidal coil apparatus as in claim 1, wherein said reinforcing members are wedge-shaped and the reinforcing members of adjacent coil support frames have opposing contacting surfaces continuous with opposing contacting surfaces of said wedge-shaped coupling portions.