Self-tightening electrical sleeve heater

Details Self-tightening electrical sleeve heater Self-tightening electrical sleeve heater

1998-06-05

2000-02-15

Hoang, Tu Ba

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219534, 392396, 392397, H05B 358, H05B 340, F22B 2906

Patent

active

060255773

ABSTRACT:
An electrical sleeve heater has a tubular outer wall and a heating coil inside the outer wall. An outer sleeve inside the heating coil formed with an axially throughgoing slot having angularly confronting edges is made of a material having a high coefficient of thermal expansion. An inner sleeve inside the outer sleeve is formed with an axially throughgoing slot and with outwardly projecting lips engaged through the outer-sleeve slot bearing angularly on the outer-sleeve slot edges. It is made of a material having a low coefficient of thermal expansion so that when the sleeves are heated the outer-sleeve edges press the inner-sleeve lips together and thereby decrease the radial inner diameter of the inner sleeve.

REFERENCES:
patent: 3774013 (1973-11-01), Keep et al.
patent: 3829657 (1974-08-01), Hinz
patent: 5080579 (1992-01-01), Specht
patent: 5460330 (1995-10-01), Steeb et al.
patent: 5549078 (1996-08-01), Annecharico et al.
patent: 5667712 (1997-09-01), Sutorius et al.
patent: 5830524 (1998-11-01), Braun
patent: 5850072 (1998-12-01), Eckert
patent: 5871786 (1999-02-01), Hume et al.

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