Patent ID: 7494736

Claim:
An assembly comprising: a dielectric frame including: a plurality of segments, each segment having opposing first and second surfaces and first and second ends portions, each of said first and second end portions having an end surface and a cutout extending from the end surface of the end portion along the length of the segment and from said first surface to said second surface; said segments being arranged in abutting relationship with the first surfaces of the segments aligned and the second surfaces of said segments aligned and with the end surface of a first end portion of a segment abutting the end surface of the second end portion of the adjacent segment, the cutouts of the first and second end portions of abutting segments forming a keyway; a plurality of keys, each key situated in a keyway so as to hold the abutting segments together; and wherein certain of said segments have a recess in the first surface of the segment in one or more of the first end portion and the second end portion of the segment adjacent the cutout, each said recess comprising a surface inclined into the thickness of the respective segment, each said recess being adjacent the far end of the respective cutout, said far end being farthest from the end surface of the end portion of the segment having the cutout, and each said recess being followed by a surface which is level and ends at the portions of the adjacent cutout; and wherein each said key has opposing first and second surfaces, said first surface of each key being aligned with the first surfaces of the abutting segments held together by that key, and each key in a keyway defined by cutouts having adjacent recesses has opposing ends of the first surface of the key inclined into the thickness of the key.