| 摘要 |
There is disclosed an electrically resistance insulator for use in supporting a helical heater coil at seven locations on the coil. The insulator is supported from a support structure and has a pair of arms that extend from the base for supporting the heater coil. The arms have an intermediate slot and two inwardly extending notches at the bottom of the arms. The notches and the intermediate slot support three consecutive convolutions of the coil relative to the insulator at one axial side of the coil. The arms of the insulator further have shoulders which provide a widened slot area and defined lug portions at the upper parts of the arms. The width of the lug portions taper outwardly to permit for two adjacent convolutions of the heater coil to be supported on opposing sides of each of the lug portions. Since two lug portions are provided, one for each arm, the heater coil is supported at four locations consecutive coil convolutions by the lug portions of the insulator. The lug portions extend beyond the shoulder to support the four coil convolutions at convolutions diametrically opposed and interleaved with the three consecutive coil convolutions of the one axial side of the coil. The heater coil is held in place reducing bowing of the heater coil above the insulator.
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