Length-adjustable electrical sleeve heater

Details Length-adjustable electrical sleeve heater Length-adjustable electrical sleeve heater

1996-09-27

1998-08-25

Walberg, Teresa J.

Electric heating

Heating devices

With heating unit structure

219535, 285 212, 285302, H05B 302, H05B 358, F16L 1302, F16L 1502

Patent

active

057985049

ABSTRACT:
A sleeve heater has a pair of end tubes centered on a common axis and having axially confronting and spaced inner ends, an electrically resistive helicoidal heating coil centered on the axis, and at least one tubular center tube coupled to the end tubes at the inner ends thereof and axially and angularly slidable on at least one of the end tubes so that the length of the heater can be adjusted. The coil has a pair of end sections of relatively shallow pitch in the end tubes and a center section of relatively steep pitch between the inner ends. Thus with this system the user can alter the length of the sleeve heater.

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