Electric heating elements

Details Electric heating elements Electric heating elements

1979-07-11

1981-05-12

Mehr, Milton S.

Metal working

Method of mechanical manufacture

Electrical device making

72 12, 72 16, 72 17, H01C 1700, B21B 3702

Patent

active

042663377

ABSTRACT:
The present invention is for the purpose of measuring the increase in growth or length of a sheathed heating element as it is reduced in transverse size to compact the refractory material therein, and feeding the growth to a logic control unit which is preset by an operator to obtain the desired final target length of the element within acceptable limits. The logic control unit, by computation, automatically subtracts the growth length from a preset length growth reference and makes the necessary additional computations that will send the proper signal to a motor control unit. The motor control unit translates the signal fed to it and in turn sends a signal to operate stepper motors, the latter controlling the bight between final compression rolls to compress the element just enough to elongate it within the target length range.

REFERENCES:
patent: Re25075 (1961-10-01), Hessenberg
patent: 2332797 (1943-10-01), Hume
patent: 3000243 (1961-09-01), Stringer
patent: 3007235 (1961-11-01), Yoke
patent: 3807207 (1974-04-01), Obdrzalek

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