Patent ID: 8168927

Claim:
An arrangement for supporting a helical wire coil heating element, the arrangement comprising: a closed elongated tubular conduit having an open interior; a supporting frame attached to and extending radially inwardly from the elongated tubular conduit, the supporting frame comprising a rail extending radially inwardly from the tubular conduit and having a plurality of supporting arms extending radially inwardly from the rail into the open interior in a circular pattern when viewed in the direction of elongation of the tubular conduit; a plurality of insulating standoffs; wherein each standoff in the plurality is a longitudinal member that is attached to a respective supporting arm such that the length of the standoff is transverse to the radially inwardly extending supporting arm; wherein each standoff has opposing ends that receive and retain different pairs of individual convolutions of a helical wire coil heating element; and an elongated helical wire coil heating element attached to each of the opposing ends of the standoff such that the heating element wraps uniformly around opposite sides of the frame in a circular path around the open interior and is evenly spaced apart from the tubular conduit along its length.